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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Aug. 01, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	NextDecade Corp.
Entity Central Index Key	0001612720
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Filer Category	Accelerated Filer
Common Stock Outstanding		110,535,922
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 4,543	$ 3,169
Investment securities	52,573	72,453
Prepaid expenses and other current assets	1,755	1,310
Total current assets	58,871	76,932
Property, plant and equipment, net	104,198	92,070
Operating lease right-of-use assets, net	1,608
Total assets	164,677	169,002
Current liabilities
Accounts payable	1,856	719
Share-based compensation liability	182	3,018
Accrued liabilities and other current liabilities	4,789	8,353
Current operating lease liabilities	1,784
Total current liabilities	8,611	12,090
Non-current common stock warrant liabilities	11,216	7,441
Non-current operating lease liabilities	273
Total liabilities	20,100	19,531
Commitments and contingencies (Note 11)
Stockholders’ equity
Common stock, $0.0001 par value Authorized: 480.0 million shares at June 30, 2019 and December 31, 2018 Issued and outstanding: 107.2 million shares and 106.9 million shares at June 30, 2019 and December 31, 2018, respectively	11	11
Treasury stock: 103,198 shares and 6,425 shares at June 30, 2019 and December 31, 2018, respectively, at cost	(466)	(35)
Preferred stock, $0.0001 par value Authorized: 0.9 million, after designation of the series A and series B convertible preferred stock Issued and outstanding: none at June 30, 2019 and December 31, 2018
Additional paid-in-capital	170,374	180,862
Accumulated deficit	(116,592)	(97,617)
Total stockholders’ equity	53,327	83,221
Total liabilities, series A and series B convertible preferred stock and stockholders’ equity	164,677	169,002
Series A convertible preferred stock
Current liabilities
Convertible preferred stock	44,263	40,091
Series B convertible preferred stock
Current liabilities
Convertible preferred stock	$ 46,987	$ 26,159

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	480,000,000	480,000,000
Common stock, shares issued	107,200,000	106,900,000
Common stock, shares outstanding	107,200,000	106,900,000
Treasury Stock, shares	103,198	6,425
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	900,000	900,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series A convertible preferred stock
Temporary equity, liquidation preference per share	$ 1,000	$ 1,000
Temporary equity, shares issued	54,854	51,720
Temporary equity, shares outstanding	54,854	51,720
Series B convertible preferred stock
Temporary equity, liquidation preference per share	$ 1,000	$ 1,000
Temporary equity, shares issued	52,818	29,636
Temporary equity, shares outstanding	52,818	29,636

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operations
Revenues	$ 0	$ 0	$ 0	$ 0
Operating expenses
General and administrative expense (recovery)	(5,076)	3,318	6,960	19,319
Invitation to bid contract costs	10,163		10,163
Land option and lease expense	451	250	862	500
Depreciation expense	43	48	85	77
Total operating expenses	5,581	3,616	18,070	19,896
Total operating loss	(5,581)	(3,616)	(18,070)	(19,896)
Other income (expense)
Loss on common stock warrant liabilities	(1,641)		(1,838)
Interest income, net	409	131	875	253
Other	94	3	271	(39)
Total other (expense) income	(1,138)	134	(692)	214
Net loss attributable to NextDecade Corporation	(6,719)	(3,482)	(18,762)	(19,682)
Preferred stock dividends			(4,972)
Deemed dividends on Series A Convertible Preferred Stock	(488)		(1,039)
Net loss attributable to common stockholders	$ (7,207)	$ (3,482)	$ (24,773)	$ (19,682)
Net loss per common share - basic and diluted	$ (0.07)	$ (0.03)	$ (0.23)	$ (0.18)
Weighted average shares outstanding - basic and diluted	107,061	106,398	107,001	106,393

Consolidated Statement of Stockholders Equity, Series A and Series B Convertible Preferred Stock - USD ($) shares in Thousands, $ in Thousands	Series A convertible preferred stock	Series B convertible preferred stock	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total
Balance at the beginning of the period at Dec. 31, 2017			$ 11		$ 158,738	$ (55,617)	$ (40)	$ 103,092
Balance at the beginning of the period (in shares) at Dec. 31, 2017			106,275
Increase (decrease) in equity
Share-based compensation					12,440			12,440
Restricted stock vesting (in shares)			123
Net loss						(16,200)		(16,200)
Balance at the end of the period at Mar. 31, 2018			$ 11		171,178	(71,857)		99,332
Balance at the end of the period (in shares) at Mar. 31, 2018			106,398
Balance at the beginning of the period at Dec. 31, 2017			$ 11		158,738	(55,617)	(40)	103,092
Balance at the beginning of the period (in shares) at Dec. 31, 2017			106,275
Increase (decrease) in equity
Deemed dividends - accretion of beneficial conversion feature - temporary equity	$ 0
Net loss								(19,682)
Balance at the end of the period at Jun. 30, 2018			$ 11		169,454	(75,339)		94,126
Balance at the end of the period (in shares) at Jun. 30, 2018			106,398
Increase (decrease) in equity
Adoption of ASU						(40)	$ 40
Balance at the beginning of the period at Mar. 31, 2018			$ 11		171,178	(71,857)		99,332
Balance at the beginning of the period (in shares) at Mar. 31, 2018			106,398
Increase (decrease) in equity
Share-based compensation					(1,724)			(1,724)
Deemed dividends - accretion of beneficial conversion feature - temporary equity	0
Net loss						(3,482)		(3,482)
Balance at the end of the period at Jun. 30, 2018			$ 11		169,454	(75,339)		94,126
Balance at the end of the period (in shares) at Jun. 30, 2018			106,398
Balance at the beginning of the period at Dec. 31, 2018			$ 11	$ (35)	180,862	(97,617)		83,221
Balance at the beginning of the period (in shares) at Dec. 31, 2018			106,856	6
Balance at the beginning of the period at Dec. 31, 2018	40,091	$ 26,159
Increase (decrease) in equity
Share-based compensation					5,884			5,884
Restricted stock vesting					495			495
Restricted stock vesting (in shares)			180
Shares repurchased related to share-based compensation				$ (260)				(260)
Shares repurchased related to share-based compensation (in shares)			(65)	(65)
Preferred stock dividends					(4,972)			(4,972)
Preferred stock dividends	3,133	1,819
Deemed dividends - accretion of beneficial conversion feature					(551)			(551)
Deemed dividends - accretion of beneficial conversion feature - temporary equity	551
Net loss						(12,043)		(12,043)
Balance at the end of the period at Mar. 31, 2019			$ 11	$ (295)	183,834	(109,873)		73,677
Balance at the end of the period (in shares) at Mar. 31, 2019			106,971	71
Balance at the end of the period at Mar. 31, 2019	43,775	27,978
Balance at the beginning of the period at Dec. 31, 2018			$ 11	$ (35)	180,862	(97,617)		83,221
Balance at the beginning of the period (in shares) at Dec. 31, 2018			106,856	6
Balance at the beginning of the period at Dec. 31, 2018	40,091	26,159
Increase (decrease) in equity
Preferred stock dividends								(4,972)
Deemed dividends - accretion of beneficial conversion feature - temporary equity	1,000
Net loss								(18,762)
Balance at the end of the period at Jun. 30, 2019			$ 11	$ (466)	170,374	(116,592)		53,327
Balance at the end of the period (in shares) at Jun. 30, 2019			107,169	103
Balance at the end of the period at Jun. 30, 2019	44,263	46,987
Increase (decrease) in equity
Adoption of ASU \| Accounting Standards Update 2016-02						(213)		(213)
Adoption of ASU \| Accounting Standards Update 2018-07					2,116			2,116
Balance at the beginning of the period at Mar. 31, 2019			$ 11	$ (295)	183,834	(109,873)		73,677
Balance at the beginning of the period (in shares) at Mar. 31, 2019			106,971	71
Balance at the beginning of the period at Mar. 31, 2019	43,775	27,978
Increase (decrease) in equity
Share-based compensation					(12,972)			(12,972)
Restricted stock vesting (in shares)			230
Shares repurchased related to share-based compensation				$ (171)				(171)
Shares repurchased related to share-based compensation (in shares)			(32)	32
Preferred stock dividends		19,009
Deemed dividends - accretion of beneficial conversion feature					(488)			(488)
Deemed dividends - accretion of beneficial conversion feature - temporary equity	488
Net loss						(6,719)		(6,719)
Balance at the end of the period at Jun. 30, 2019			$ 11	$ (466)	$ 170,374	$ (116,592)		$ 53,327
Balance at the end of the period (in shares) at Jun. 30, 2019			107,169	103
Balance at the end of the period at Jun. 30, 2019	$ 44,263	$ 46,987

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net loss attributable to NextDecade Corporation	$ (18,762)	$ (19,682)
Adjustment to reconcile net loss to net cash used in operating activities
Depreciation	85	77
Share-based compensation expense	(7,817)	11,251
Loss on common stock warrant liabilities	1,838
(Gain) loss on investment securities	(280)	25
Realized gain on investment securities	(34)
Amortization of right-of-use asset	399
Changes in operating assets and liabilities:
Prepaid expenses	(342)	(96)
Accounts payable	546	(58)
Operating lease liabilities	(266)
Accrued expenses and other liabilities	(601)	(578)
Net cash used in operating activities	(25,234)	(9,061)
Investing activities:
Acquisition of property, plant and equipment	(14,077)	(7,746)
Proceeds from sale of investment securities	36,000
Purchase of investment securities	(15,803)	(50)
Net cash provided by (used in) investing activities	6,120	(7,796)
Financing activities:
Proceeds from equity issuance	20,945
Preferred stock dividends	(26)
Shares repurchased related to share-based compensation	(431)
Net cash provided by financing activities	20,488
Net increase (decrease) in cash and cash equivalents	1,374	(16,857)
Cash and cash equivalents – beginning of period	3,169	35,703
Cash and cash equivalents – end of period	4,543	18,846
Non-cash investing activities:
Accounts payable for acquisition of property, plant and equipment	958	453
Accrued liabilities for acquisition of property, plant and equipment	1,058	$ 6,930
Non-cash financing activities:
Paid-in-kind dividends on series A and series B convertible preferred stock	4,952
Accretion of deemed dividends on series A convertible preferred stock	$ 1,039

Background and Basis of Presentation	6 Months Ended
Background and Basis of Presentation	Jun. 30, 2019
Background and Basis of Presentation
Background and Basis of Presentation	Note 1 — Background and Basis of Presentation NextDecade Corporation engages in development activities related to the liquefaction and sale of liquefied natural gas (“LNG”). We have focused and continue to focus our development activities on the Rio Grande LNG terminal facility at the Port of Brownsville in southern Texas (the “Terminal”) and an associated 137-mile Rio Bravo pipeline to supply gas to the Terminal (the “Pipeline” and together with the Terminal, the “Project”). In January 2017, we also secured a 994-acre site near Texas City, Texas for another potential LNG terminal (the “Galveston Bay Terminal”). Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with Rule 10‑01 of Regulation S-X. Accordingly, they do not include all the information and disclosures required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2018. In our opinion, all adjustments, consisting only of normal recurring items, which are considered necessary for a fair presentation of the unaudited consolidated financial statements, have been included. The results of operations for the three and six months ended June 30, 2019 are not necessarily indicative of the operating results for the full year. During the first quarter of 2019, the Company adopted Accounting Standards Codification (“ASC”) Topic 842, Leases (“Topic 842”), which requires lessees to recognize a right-of-use asset and a lease liability for all operating leases. The Company adopted Topic 842 using a prospective transition approach, which applies the provisions of Topic 842 at the effective date without adjusting the comparative periods presented, with certain practical expedients available to ease the burden of adoption. See Note 5 – Leases for additional information.

Prepaid Expenses and Other Current Assets

6 Months Ended

Jun. 30, 2019

Prepaid Expenses and Other Current Assets

Prepaid Expenses and Other Current Assets

Note 2 — Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):


	June 30,		December 31,
	2019		2018
Rio Grande LNG site option	$	234	$	508
Short-term security deposits		49		18
Rio Bravo Pipeline options		26		54
Prepaid insurance		144		233
Prepaid marketing and sponsorships		673		242
Other		629		255
Total prepaid expenses and other current assets	$	1,755	$	1,310

Investment Securities

6 Months Ended

Jun. 30, 2019

Investment Securities

Investment Securities

Note 3 — Investment Securities

We invest in Class L shares of the JPMorgan Managed Income Fund. The JPMorgan Managed Income Fund has an average maturity of approximately one year, duration of approximately six months, and approximately 7% of such fund’s holdings are AAA-rated with 0% non-investment grade rated.

Investment securities consisted of the following (in thousands):


	June 30,				December 31,
	2019				2018
	Fair value		Cost		Fair value		Cost
JPMorgan Managed Income Fund	$	52,573	$	52,394	$	72,453	$	72,567

Property, Plant and Equipment

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment

Property, Plant and Equipment

Note 4 — Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):


	June 30,		December 31,
	2019		2018
Fixed Assets
Computers	$	317	$	164
Furniture, fixtures, and equipment		359		316
Leasehold improvements		420		420
Total fixed assets		1,096		900
Less: accumulated depreciation		(627)		(542)
Total fixed assets, net		469		358
Project Assets (not placed in service)
Rio Grande		91,949		80,407
Rio Bravo		11,780		11,305
Total project assets		103,729		91,712
Total property, plant and equipment, net	$	104,198	$	92,070

Depreciation expense was $43 thousand and $48 thousand for each of the three months ended June 30, 2019 and 2018, respectively, and $85 thousand and $77 thousand during the six months ended June 30, 2019 and 2018, respectively.

Leases

6 Months Ended

Jun. 30, 2019

Leases

Leases

Note 5 — Leases

We currently lease approximately 38,300 square feet of office space for general and administrative purposes in Houston, Texas under a lease agreement that expires on September 30, 2020.

In January 2017, NextDecade LLC executed surface lease agreements with the City of Texas City and the State of Texas for a 994‑acre site for the Galveston Bay Terminal (collectively, the “Galveston Bay Leases”). The term of the Galveston Bay Leases is 36 months with an option to extend for an additional 12 months. Such option was included in the measurement of Operating lease right-of-use assets and Operating lease liabilities.

On March 6, 2019, Rio Grande entered into a lease agreement with the Brownsville Navigation District of Cameron County, Texas (“BND”), pursuant to which Rio Grande has agreed to lease approximately 984 acres of land situated in Cameron County, Texas for the purposes of constructing, operating and maintaining the Terminal.

The initial term of the lease is for 30 years (the “Primary Term”), which will commence on the date specified in a written notice by Rio Grande to BND (the “Effective Date Notice”), if given, confirming that Rio Grande or a Rio Grande affiliate has made a positive final investment decision (“FID”) for the first phase of the Terminal. The Effective Date may be no later than November 6, 2019 (the “Outside Effective Date”), provided, however , that in the event Rio Grande does not deliver the Effective Date Notice prior to the Outside Effective Date due to reasons unrelated to an act or omission of its own or its inability to secure one or more of the required permits for the Terminal, then the Outside Effective Date will be automatically extended on a month-to-month basis for a maximum of six months. Rio Grande has the option to renew and extend the term of the lease beyond the Primary Term for up to two consecutive renewal periods of ten years each provided that it has not caused an event of default under the lease.

In adopting Topic 842, the Company has elected the “package of practical expedients,” which permits it not to reassess under the new standard its prior conclusions about lease identification, lease classification and initial direct costs. The Company also elected the use-of-hindsight and the practical expedient pertaining to land easements. The Company elected not to apply Topic 842 to arrangements with original lease terms of 12 months or less. At lease commencement date, the Company estimated the lease liability and the right-of-use assets at present value, at inception, of $2.3 million. On January 1, 2019, upon adoption of Topic 842, the Company recorded right-of-use assets of $1.6 million, lease liabilities of $1.9 million, eliminated deferred rent of $0.1 million and recorded a cumulative-effect adjustment of $0.2 million.

The Company determines if a contractual arrangement represents or contains a lease at inception. Operating leases with lease terms greater than twelve months are included in Operating lease right-of-use assets and Operating lease liabilities in the Consolidated Balance Sheets.

Operating lease right-of-use assets and lease liabilities are recognized at the commencement date based on the present value of the future lease payments over the lease term. The Company utilizes its incremental borrowing rate in determining the present value of the future lease payments. The incremental borrowing rate is derived from information available at the lease commencement date and represents the rate of interest that the Company would have to pay to borrow on a collateralized basis over a similar term and amount equal to the lease payments in a similar economic environment. The right-of-use assets and lease liabilities may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. The Company has lease arrangements that include both lease and non-lease components. The Company accounts for non-lease components separately from the lease component.

Operating lease right-of-use assets as of June 30, 2019 are as follows (in thousands):


Office leases	$	976
Land leases		632
Total operating lease right-of-use assets, net	$	1,608

Operating lease liabilities as of June 30, 2019 are as follows (in thousands):


Office leases	$	977
Land leases		807
Total current lease liabilities		1,784
Non-current office leases		273
Non-current land leases		-
Total lease liabilities	$	2,057

Operating lease expense is as follows (in thousands):


	Three Months Ended		Six Months Ended
	June 30, 2019		June 30, 2019
Office leases	$	146	$	262
Land leases		121		241
Total operating lease expense		267		503
Short-term lease expense		25		40
Land option expense		159		319
Total land option and lease expense	$	451	$	862

Maturity of operating lease liabilities as of June 30, 2019 are as follows (in thousands, except lease term and discount rate):


2019 (remaining)	$	788
2020		1,412
2021		3
2022		—
2023		—
Thereafter		—
Total undiscounted lease payments		2,203
Discount to present value		(146)
Present value of lease liabilities	$	2,057

Weighted average remaining lease term - years		1.4
Weighted average discount rate - percent		12.0

Other information related to our operating leases for the six months ended June 30, 2019 is as follows (in thousands):


Cash paid for amounts included in the measurement of operating lease liabilities:
Cash flows from operating activities	$	367
Noncash right-of-use assets recorded for operating lease liabilities:
Adoption of Topic 842		1,562
In exchange for new operating lease liabilities during the period		446

Accrued Liabilities and Other Current Liabilities

6 Months Ended

Jun. 30, 2019

Accrued Liabilities and Other Current Liabilities

Accrued Liabilities and Other Current Liabilities

Note 6 — Accrued Liabilities and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):


	June 30,		December 31,
	2019		2018
Employee compensation expense	$	2,900	$	3,130
Project asset costs		1,058		2,014
Valve installation incentive(1)		—		2,000
Accrued legal services		131		313
Other accrued liabilities		700		896
Total accrued liabilities and other current liabilities	$	4,789	$	8,353

⁽¹⁾

In April 2018, we entered into an agreement with an intrastate pipeline company with assets near the Terminal which incentivizes the pipeline company to procure, permit and install a valve on an intrastate pipeline near the Terminal. We agreed that, upon the later of (i) March 31, 2019 and (ii) thirty days after the date on which the valve was installed, we will reimburse the pipeline company a cash amount equal to 50% of the costs incurred in connection with the valve, up to a maximum payment of $2.0 million. Such valve was installed in 2018 and we reimbursed the pipeline company $2.0 million in the first quarter of 2019.

Preferred Stock and Common Stock Warrants

6 Months Ended

Jun. 30, 2019

Preferred Stock and Common Stock Warrants

Preferred Stock and Common Stock Warrants

Note 7 – Preferred Stock and Common Stock Warrants

Preferred Stock

In August 2018, we sold an aggregate of 50,000 shares of Series A Convertible Preferred Stock, par value $0.0001 per share (the “Series A Preferred Stock), at $1,000 per share for an aggregate purchase price of $50 million and we issued an additional 1,000 shares of Series A Preferred Stock in aggregate as origination fees to the purchasers of the Series A Preferred Stock. In September 2018 and May 2019, we sold an aggregate of 29,055 shares and 20,945 shares, respectively, of Series B Convertible Preferred Stock, par value $0.0001 per share (the “Series B Preferred Stock” and, together with the Series A Preferred Stock, the “Convertible Preferred Stock”), at $1,000 per share for a combined purchase price of $50 million and we issued an additional 999 shares of Series B Preferred Stock in aggregate as origination fees to the purchasers of the Series B Preferred Stock. Warrants were issued together with the shares of Convertible Preferred Stock (“Common Stock Warrants”).

The shares of Convertible Preferred Stock bear dividends at a rate of 12% per annum, which are cumulative and accrue daily from the date of issuance on the $1,000 stated value. Such dividends are payable quarterly and may be paid in cash or in-kind. During the six months ended June 30, 2019, the Company paid-in-kind $3.1 million and $1.8 million of dividends to the holders of the Series A Preferred Stock and the Series B Preferred Stock, respectively. On July 15, 2019, the Company paid-in-kind $1.6 million and $1.2 million of dividends to the holders of the Series A Preferred Stock and the Series B Preferred Stock, respectively, as of the close of business on June 15, 2019.

Common Stock Warrants

Pursuant to ASC 815-40, Accounting for Derivative Financial Instruments Indexed to, and Potentially Settled in, a Company’s Own Stock, the fair value of the Common Stock Warrants was recorded as a non-current liability on our Consolidated Balance Sheet on the issuance dates. The Company revalues the Common Stock Warrants at each balance sheet date and recognized a loss of $1.6 million and $1.8 million during the three and six months ended June 30, 2019, respectively. The Common Stock Warrants are included in Level 3 of the fair value hierarchy.

The Common Stock Warrants have a fixed three-year term commencing on the closings of the issuances of the associated Convertible Preferred Stock. The Common Stock Warrants may only be exercised by the holders thereof at the expiration of such three-year term; however, the Company can force exercise of the Common Stock Warrants prior to expiration of such term if the volume weighted average trading price of shares of Company common stock for each trading day during any 60 of the prior 90 trading days is equal to or greater than 175% of the Conversion Price (as defined in the certificate of designations of the applicable Convertible Preferred Stock) and, in the case of the warrants issued together with the Series B Preferred Stock (the “Series B Warrants”), also if the Company simultaneously elects to force a mandatory exercise of all other warrants then outstanding and unexercised and held by any holder of parity stock.

The Company used a Monte Carlo simulation model to estimate the fair value of the Common Stock Warrants using the following assumptions:


	June 30,		December 31,
	2019		2018
Stock price	$	6.32	$	5.40
Exercise price	$	0.01	$	0.01
Risk-free rate		1.8%		2.5%
Volatility		27.6%		33.1%
Term (years)		2.4		2.7

Beneficial Conversion Feature

ASC 470-20-20 – Debt – Debt with conversion and Other Options (“ASC 470-20”) defines a beneficial conversion feature (“BCF”) as a nondetachable conversion feature that is in the money at the issuance date. The Company was required by ASC 470-20 to allocate a portion of the proceeds from the Series A Preferred Stock equal to the intrinsic value of the BCF to additional paid-in capital. We are recording the accretion of the $2.5 million Series A Preferred Stock discount attributable to the BCF as a deemed dividend using the effective yield method over the period prior to the expected conversion date. Deemed dividends on the Series A Preferred Stock was $0.5 million and zero during the three months ended June 30, 2019 and 2018, respectively, and $1.0 million and zero during the six months ended June 30, 2019 and 2018, respectively.

Initial Fair Value Allocation

Net cash proceeds from the sale of the Series B Preferred Stock in May 2019 were allocated on a fair value basis to the Series B Warrants and on a relative fair value basis to the Series B Preferred Stock.

The allocation of the net cash proceeds is as follows (in thousands):


			Allocation of Proceeds
					Series B
			Series B		Preferred
			Warrants		Stock
Gross proceeds	$	20,945
Equity issuance costs		—
Net proceeds - Initial Fair Value Allocation	$	20,945	$	1,936	$	19,009
Per balance sheet upon issuance			$	1,936	$	19,009

Net Loss Per Share

6 Months Ended

Jun. 30, 2019

Net Loss Per Share

Net Loss Per Share

Note 8 — Net Loss Per Share

The following table (in thousands, except for loss per share) reconciles basic and diluted weighted average common shares outstanding for each of the three and six months ended June 30, 2019 and 2018:


	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Weighted average common shares outstanding:
Basic		107,061		106,398		107,001		106,393
Dilutive unvested stock, Convertible Preferred Stock, Common Stock Warrants and IPO Warrants		—		—		—		—
Diluted		107,061		106,398		107,001		106,393

Basic and diluted net loss per share attributable to common stockholders	$	(0.07)	$	(0.03)	$	(0.23)	$	(0.18)

Potentially dilutive securities not included in the diluted net loss per share computations because their effect would have been anti-dilutive were as follows (in thousands):


	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Unvested stock (1)		605		417		548		396
Convertible Preferred Stock		12,647		—		11,891		—
Common Stock Warrants		1,542		—		1,462		—
IPO Warrants(2)		12,082		12,082		12,082		12,082
Total potentially dilutive common shares		26,876		12,499		25,983		12,478

⁽¹⁾

Does not include 4.1 million shares for each of the three and six months ended June 30, 2019 and 16.4 million shares for the three and six months ended June 30, 2018, of unvested stock because the performance conditions had not yet been satisfied as of June 30, 2019 and 2018, respectively.

⁽²⁾

In 2015, the Company issued warrants in connection with its initial public offering (the “IPO Warrants”). The IPO Warrants are exercisable at a price of $11.50 per share and expire on July 24, 2022. The Company may redeem the IPO Warrants at a price of $0.01 per IPO Warrant upon 30 days’ notice only if the last sale price of Company common stock is at least $17.50 per share for any 20 trading days within a 30-trading day period. If the Company redeems the IPO Warrants in this manner, the Company will have the option to do so on a cashless basis with the issuance of an economically equivalent number of shares of Company common stock.

Share-based Compensation

6 Months Ended

Jun. 30, 2019

Share-based Compensation.

Share-based Compensation

Note 9 — Share-based Compensation

We have granted shares of Company common stock and restricted Company common stock to employees, consultants and a non-employee director under our 2017 Omnibus Incentive Plan (the “2017 Plan”) and in connection with our special meeting of stockholders held on July 24, 2017.

Total share-based compensation consisted of the following (in thousands):


	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Share-based compensation:
Equity awards	$	(12,972)	$	(1,724)	$	(7,088)	$	10,716
Liability awards		(20)		2,179		(20)		2,132
Total share-based compensation		(12,992)		455		(7,108)		12,848
Capitalized share-based compensation		(163)		(1,438)		(709)		(1,597)
Total share-based compensation expense	$	(13,155)	$	(983)	$	(7,817)	$	11,251

On January 1, 2019, we adopted Accounting Standards Update (“ASU”) 2018-07, Compensation-Stock Compensation (“ASU 2018-07”). This standard simplifies aspects of share-based compensation issued to non-employees by making the guidance consistent with accounting for employee share-based compensation. Upon adoption of this standard, we reclassified $2.1 million from Share-based compensation liability to Additional paid-in-capital in our Consolidated Balance Sheets.

Certain employee contracts provided for cash bonuses upon a positive FID in the Project (the “FID Bonus”). In January 2018, the nominating, corporate governance and compensation committee of the board of directors approved, and certain employees party to such contracts accepted, an amendment to such contracts whereby the FID Bonuses would be settled in shares of Company common stock equal to 110% of the FID Bonus. The associated liability for FID Bonuses to be settled in shares of Company common stock of $0.2 million and $0.4 million is included in Share-based compensation liability in our Consolidated Balance Sheets at June 30, 2019 and December 31, 2018, respectively.

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2019
Income Taxes
Income Taxes	Note 10 — Income Taxes Due to our cumulative loss position, we have established a full valuation allowance against our deferred tax assets at June 30, 2019 and December 31, 2018. Due to our full valuation allowance, we have not recorded a provision for federal or state income taxes during each of the three and six months ended June 30, 2019 and 2018.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2019
Commitments and Contingencies
Commitments and Contingencies	Note 11 — Commitments and Contingencies Legal Proceedings From time to time the Company may be subject to various claims and legal actions that arise in the ordinary course of business. As of June 30, 2019, management is not aware of any claims or legal actions that, separately or in the aggregate, are likely to have a material adverse effect on the Company’s financial position, results of operations or cash flows, although the Company cannot guarantee that a material adverse effect will not occur. Enterprise Resource Planning system During the first and second quarters of 2019, we entered into agreements with a third-party to design and implement the first phase of a new enterprise resource planning system. In connection with these agreements, we are committed to spend approximately $2.7 million, all of which is expected to be incurred in 2019. Engineering, Procurement and Construction Contract During the second quarter of 2019, we issued a limited notice to proceed (“LNTP”) to Bechtel Oil, Gas and Chemicals, Inc. (“Bechtel”) under our engineering, procurement and construction contract with Bechtel. In connection with the issuance of the LNTP, we are committed to spend approximately $30.3 million in 2019, of which $15.0 million may be settled in Company common stock.

Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2019

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Note 12 — Recent Accounting Pronouncements

The following table provides a brief description of recent accounting standards that have not been adopted by the Company as of June 30, 2019:


Standard	Description	Expected Date of Adoption	Effect on our Consolidated Financial Statements or Other Significant Matters
ASU 2018-15, Intangibles, Goodwill and Other Internal Use Software (Subtopic 350-40)	The amendments in this update align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this update. Accordingly, the amendments in this update require an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. These amendments may be early adopted and are required to be applied retrospectively or prospectively to all implementation costs incurred after the date of adoption.	January 1, 2020	We are currently evaluating the effect of this standard on our Consolidated Financial Statements.

Additionally, the following table provides a brief description of recent accounting standards that were adopted by the Company during the reporting period:


Standard	Description	Date of Adoption	Effect on our Consolidated Financial Statements or Other Significant Matters
ASU 2016‑02, Leases (Topic 842)	This standard requires a lessee to recognize leases on its balance sheet by recording a lease liability representing the obligation to make future lease payments and a right-of-use asset representing the right to use the underlying asset for the lease term. A lessee is permitted to make an election not to recognize lease assets and liabilities for leases with a term of 12 months or less. The standard also modifies the definition of a lease and requires expanded disclosures. This standard may be early adopted, and must be adopted using a modified retrospective approach with certain available practical expedients.	January 1, 2019	We have adopted this accounting standard using a prospective transition approach, which applies the provisions of the new guidance at the effective date without adjusting the comparative periods presented. Upon adoption of this standard, we recognized operating lease right-of use assets of $1.6 million and operating lease liabilities of $1.9 million. See Note 5 - Leases of our Notes to Consolidated Financial Statements for additional details.
ASU 2018-07, Compensation-Stock Compensation (Topic 718)	This standard simplifies aspects of share-based compensation issued to non-employees by making the guidance consistent with accounting for employee share-based compensation. The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor's own operations by issuing share-based payment awards. This standard may be early adopted, and must be adopted using a modified retrospective approach.	January 1, 2019	Upon adoption of this standard, we reclassified $2.1 million from Share-based compensation liability to Additional paid-in-capital in our Consolidated Balance Sheets. The fair value of share based compensation awards to non-employees will not be remeasured subsequent to December 31, 2018.

Prepaid Expenses and Other Current Assets (Tables)

6 Months Ended

Jun. 30, 2019

Prepaid Expenses and Other Current Assets

Schedule of prepaid expenses and other current assets

Prepaid expenses and other current assets consisted of the following (in thousands):


	June 30,		December 31,
	2019		2018
Rio Grande LNG site option	$	234	$	508
Short-term security deposits		49		18
Rio Bravo Pipeline options		26		54
Prepaid insurance		144		233
Prepaid marketing and sponsorships		673		242
Other		629		255
Total prepaid expenses and other current assets	$	1,755	$	1,310

Investment Securities (Tables)

6 Months Ended

Jun. 30, 2019

Investment Securities

Schedule of investment securities

Investment securities consisted of the following (in thousands):


	June 30,				December 31,
	2019				2018
	Fair value		Cost		Fair value		Cost
JPMorgan Managed Income Fund	$	52,573	$	52,394	$	72,453	$	72,567

Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment

Schedule of property, plant and equipment

Property, plant and equipment consisted of the following (in thousands):


	June 30,		December 31,
	2019		2018
Fixed Assets
Computers	$	317	$	164
Furniture, fixtures, and equipment		359		316
Leasehold improvements		420		420
Total fixed assets		1,096		900
Less: accumulated depreciation		(627)		(542)
Total fixed assets, net		469		358
Project Assets (not placed in service)
Rio Grande		91,949		80,407
Rio Bravo		11,780		11,305
Total project assets		103,729		91,712
Total property, plant and equipment, net	$	104,198	$	92,070

Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases

Schedule of operating lease asset

Operating lease right-of-use assets as of June 30, 2019 are as follows (in thousands):


Office leases	$	976
Land leases		632
Total operating lease right-of-use assets, net	$	1,608

Schedule of operating lease liabilities

Operating lease liabilities as of June 30, 2019 are as follows (in thousands):


Office leases	$	977
Land leases		807
Total current lease liabilities		1,784
Non-current office leases		273
Non-current land leases		-
Total lease liabilities	$	2,057

Summary of operating lease expense

Operating lease expense is as follows (in thousands):


	Three Months Ended		Six Months Ended
	June 30, 2019		June 30, 2019
Office leases	$	146	$	262
Land leases		121		241
Total operating lease expense		267		503
Short-term lease expense		25		40
Land option expense		159		319
Total land option and lease expense	$	451	$	862

Summary of maturity of operating lease liabilities

Maturity of operating lease liabilities as of June 30, 2019 are as follows (in thousands, except lease term and discount rate):


2019 (remaining)	$	788
2020		1,412
2021		3
2022		—
2023		—
Thereafter		—
Total undiscounted lease payments		2,203
Discount to present value		(146)
Present value of lease liabilities	$	2,057

Weighted average remaining lease term - years		1.4
Weighted average discount rate - percent		12.0

Schedule of other information related to our operating leases

Other information related to our operating leases for the six months ended June 30, 2019 is as follows (in thousands):


Cash paid for amounts included in the measurement of operating lease liabilities:
Cash flows from operating activities	$	367
Noncash right-of-use assets recorded for operating lease liabilities:
Adoption of Topic 842		1,562
In exchange for new operating lease liabilities during the period		446

Accrued Liabilities and Other Current Liabilities (Tables)

6 Months Ended

Jun. 30, 2019

Accrued Liabilities and Other Current Liabilities

Schedule of accrued expenses and other current liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):


	June 30,		December 31,
	2019		2018
Employee compensation expense	$	2,900	$	3,130
Project asset costs		1,058		2,014
Valve installation incentive(1)		—		2,000
Accrued legal services		131		313
Other accrued liabilities		700		896
Total accrued liabilities and other current liabilities	$	4,789	$	8,353

⁽¹⁾

Preferred Stock and Common Stock Warrants (Tables)

6 Months Ended

Jun. 30, 2019

Preferred Stock and Common Stock Warrants

Summary of assumptions used to estimate fair value


	June 30,		December 31,
	2019		2018
Stock price	$	6.32	$	5.40
Exercise price	$	0.01	$	0.01
Risk-free rate		1.8%		2.5%
Volatility		27.6%		33.1%
Term (years)		2.4		2.7

Schedule of allocation of net cash proceeds

The allocation of the net cash proceeds is as follows (in thousands):


			Allocation of Proceeds
					Series B
			Series B		Preferred
			Warrants		Stock
Gross proceeds	$	20,945
Equity issuance costs		—
Net proceeds - Initial Fair Value Allocation	$	20,945	$	1,936	$	19,009
Per balance sheet upon issuance			$	1,936	$	19,009

Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Net Loss Per Share

Schedule of basic and diluted weighted average common shares outstanding


	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Weighted average common shares outstanding:
Basic		107,061		106,398		107,001		106,393
Dilutive unvested stock, Convertible Preferred Stock, Common Stock Warrants and IPO Warrants		—		—		—		—
Diluted		107,061		106,398		107,001		106,393

Basic and diluted net loss per share attributable to common stockholders	$	(0.07)	$	(0.03)	$	(0.23)	$	(0.18)

Schedule of antidilutive securities excluded from computation of earnings per share

Potentially dilutive securities not included in the diluted net loss per share computations because their effect would have been anti-dilutive were as follows (in thousands):


	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Unvested stock (1)		605		417		548		396
Convertible Preferred Stock		12,647		—		11,891		—
Common Stock Warrants		1,542		—		1,462		—
IPO Warrants(2)		12,082		12,082		12,082		12,082
Total potentially dilutive common shares		26,876		12,499		25,983		12,478

⁽¹⁾

⁽²⁾

Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Compensation.

Schedule of share-based compensation

Total share-based compensation consisted of the following (in thousands):


	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Share-based compensation:
Equity awards	$	(12,972)	$	(1,724)	$	(7,088)	$	10,716
Liability awards		(20)		2,179		(20)		2,132
Total share-based compensation		(12,992)		455		(7,108)		12,848
Capitalized share-based compensation		(163)		(1,438)		(709)		(1,597)
Total share-based compensation expense	$	(13,155)	$	(983)	$	(7,817)	$	11,251

Recent Accounting Pronouncements (Tables)

6 Months Ended

Jun. 30, 2019

Recent Accounting Pronouncements

Schedule of recent accounting standards that have not been adopted


Standard	Description	Expected Date of Adoption	Effect on our Consolidated Financial Statements or Other Significant Matters
ASU 2018-15, Intangibles, Goodwill and Other Internal Use Software (Subtopic 350-40)	The amendments in this update align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this update. Accordingly, the amendments in this update require an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. These amendments may be early adopted and are required to be applied retrospectively or prospectively to all implementation costs incurred after the date of adoption.	January 1, 2020	We are currently evaluating the effect of this standard on our Consolidated Financial Statements.

Schedule of recent accounting standards that were adopted


Standard	Description	Date of Adoption	Effect on our Consolidated Financial Statements or Other Significant Matters
ASU 2016‑02, Leases (Topic 842)	This standard requires a lessee to recognize leases on its balance sheet by recording a lease liability representing the obligation to make future lease payments and a right-of-use asset representing the right to use the underlying asset for the lease term. A lessee is permitted to make an election not to recognize lease assets and liabilities for leases with a term of 12 months or less. The standard also modifies the definition of a lease and requires expanded disclosures. This standard may be early adopted, and must be adopted using a modified retrospective approach with certain available practical expedients.	January 1, 2019	We have adopted this accounting standard using a prospective transition approach, which applies the provisions of the new guidance at the effective date without adjusting the comparative periods presented. Upon adoption of this standard, we recognized operating lease right-of use assets of $1.6 million and operating lease liabilities of $1.9 million. See Note 5 - Leases of our Notes to Consolidated Financial Statements for additional details.
ASU 2018-07, Compensation-Stock Compensation (Topic 718)	This standard simplifies aspects of share-based compensation issued to non-employees by making the guidance consistent with accounting for employee share-based compensation. The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor's own operations by issuing share-based payment awards. This standard may be early adopted, and must be adopted using a modified retrospective approach.	January 1, 2019	Upon adoption of this standard, we reclassified $2.1 million from Share-based compensation liability to Additional paid-in-capital in our Consolidated Balance Sheets. The fair value of share based compensation awards to non-employees will not be remeasured subsequent to December 31, 2018.

Background and Basis of Presentation (Details)	1 Months Ended	6 Months Ended
Background and Basis of Presentation (Details)	Jan. 31, 2017 a	Jun. 30, 2019 mi
Leases
Length of pipeline to supply gas \| mi		137
City Of Texas City and State Of Texas (Galveston Bay) \| Surface leases
Leases
Area of land leased \| a	994

Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Prepaid Expenses and Other Current Assets
Rio Grande LNG site option	$ 234	$ 508
Short-term security deposits	49	18
Rio Bravo Pipeline options	26	54
Prepaid insurance	144	233
Prepaid marketing and sponsorships	673	242
Other	629	255
Total prepaid expenses and other current assets	$ 1,755	$ 1,310

Investment Securities (Details) - JPMorgan Managed Income Fund - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Investment securities
Maturity period of mutual funds	1 year
Duration of mutual fund	6 months
Non-investment grade rated holdings (as a percent)	0.00%
Fair Value	$ 52,573	$ 72,453
Cost	$ 52,394	$ 72,567
AAA rated
Investment securities
Investment holdings grade rated (as a percent)	7.00%

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment
Total property, plant and equipment, net	$ 104,198		$ 104,198		$ 92,070
Depreciation expense	43	$ 48	85	$ 77
Non project assets
Property, Plant and Equipment
Property, plant and equipment, gross	1,096		1,096		900
Less: accumulated depreciation	(627)		(627)		(542)
Total property, plant and equipment, net	469		469		358
Computers
Property, Plant and Equipment
Property, plant and equipment, gross	317		317		164
Furniture, fixtures, and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	359		359		316
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	420		420		420
Project assets
Property, Plant and Equipment
Project assets in progress	103,729		103,729		91,712
Rio Grande
Property, Plant and Equipment
Project assets in progress	91,949		91,949		80,407
Rio Bravo
Property, Plant and Equipment
Project assets in progress	$ 11,780		$ 11,780		$ 11,305

Leases - Narrative (Details) $ in Thousands		1 Months Ended
Leases - Narrative (Details) $ in Thousands	Mar. 06, 2019 a item	Jan. 31, 2017 USD ($) a	Jun. 30, 2019 USD ($) ft²	Mar. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
Leases
Operating lease right-of-use assets, net			$ 1,608
Operating lease liability			$ 2,057
Accounting Standards Update 2016-02
Leases
Cumulative effect adjustment from adoption of ASU 2016-01				$ 213
Accounting Standards Update 2016-02 \| Proforma Adjustment
Leases
Operating lease right-of-use assets, net		$ 2,300
Operating lease liability		$ 2,300
Accounting Standards Update 2016-02 \| Adjustments
Leases
Operating lease right-of-use assets, net					$ 1,600
Operating lease liability					1,900
Deferred rent					(100)
Cumulative effect adjustment from adoption of ASU 2016-01					$ 200
Office space lease
Leases
Area of property leased \| ft²			38,300
Operating lease right-of-use assets, net			$ 976
Land leases
Leases
Operating lease right-of-use assets, net			$ 632
City Of Texas City and State Of Texas (Galveston Bay) \| Surface leases
Leases
Area of land leased/to be leased \| a		994
Term of lease agreement		36 months
Existence of option to extend		true
Option to extend term		12 months
BND \| Land leases
Leases
Area of land leased/to be leased \| a	984
Term of lease agreement	30 years
Maximum period for automatic extension for Outside Effective Date	6 months
Number of renewal term \| item	2
Option to extend term	10 years
Option to extend term, lease not yet commenced	true

Leases - Operating lease (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Leases - Operating lease (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases
Operating lease right-of-use assets, net	$ 1,608		$ 1,608
Total current lease liabilities	1,784		1,784
Non-current lease liabilities	273		273
Operating lease liability	2,057		2,057
Operating lease expense
Total operating lease expense	267		503
Short-term lease expense	25		40
Land option expense	159		319
Total land option and lease expense	451	$ 250	862	$ 500
Office space lease
Leases
Operating lease right-of-use assets, net	976		976
Total current lease liabilities	977		977
Non-current lease liabilities	273		273
Operating lease expense
Total operating lease expense	146		262
Land leases
Leases
Operating lease right-of-use assets, net	632		632
Total current lease liabilities	807		807
Operating lease expense
Total operating lease expense	$ 121		$ 241

Leases - Maturity of operating lease liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019 (remaining)	$ 788
2020	1,412
2021	3
Total undiscounted lease payments	2,203
Discount to present value	(146)
Present Value of lease liabilities	$ 2,057
Weighted average remaining lease term - years	1 year 4 months 24 days
Weighted average discount rate - percent	12.00%

Leases - Other information related to operating leases (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of operating lease liabilities:
Cash flows from operating activities	$ 367
Noncash right-of-use assets recorded for operating lease liabilities:
Adoption of Topic 842	1,562
In exchange for new operating lease liabilities during the period	$ 446

Accrued Liabilities and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accrued Liabilities and Other Current Liabilities
Employee compensation expense	$ 2,900	$ 3,130
Project asset costs	1,058	2,014
Valve installation incentive		2,000
Accrued legal services	131	313
Other accrued liabilities	700	896
Total accrued liabilities and other current liabilities	$ 4,789	$ 8,353

Accrued Liabilities and Other Current Liabilities - Valve installation (Details) - Intrastate Pipeline Company - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2018	Mar. 31, 2019
Other Commitments [Line Items]
Period after valve installation for reimbursement of costs	30 days
Percentage of valve costs for reimbursement	50.00%
Maximum reimbursement payment per agreement	$ 2.0
Valve reimbursement payment made during period		$ 2.0

Preferred Stock and Common Stock Warrants - Preferred Stock (Details) $ in Thousands		1 Months Ended			3 Months Ended	6 Months Ended	9 Months Ended
	Jul. 15, 2019 USD ($)	May 31, 2019 $ / shares shares	Sep. 30, 2018 shares	Aug. 31, 2018 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 $ / shares	May 31, 2019 USD ($) $ / shares shares
Convertible Preferred Stock
Stockholders’ Equity
Temporary equity, issued value per share					1,000	1,000
Dividends, temporary equity percentage						12.00%
Series A convertible preferred stock
Stockholders’ Equity
Number of shares issued \| shares				50,000
Convertible preferred stock, par value				$ 0.0001
Temporary equity, issued value per share				1,000
Aggregate purchase price \| $				$ 50,000
Additional shares issued as origination fees \| shares				1,000
Paid-in-kind dividends \| $	$ 1,600				$ 3,100
Series B convertible preferred stock
Stockholders’ Equity
Number of shares issued \| shares		20,945	29,055
Convertible preferred stock, par value		$ 0.0001					$ 0.0001
Temporary equity, issued value per share		1,000					1,000
Aggregate purchase price \| $							$ 50,000
Additional shares issued as origination fees \| shares							999
Paid-in-kind dividends \| $	$ 1,200				$ 1,800

Preferred Stock and Common Stock Warrants - Warrants (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Warrants
Loss recognized on revalued warrants	$ 1,641	$ 1,838
Common Stock Warrants
Warrants
Term of warrants (in years)	3 years	3 years
Number of trading days to exercise prior to expiration term		60 days
Number of consecutive trading days to exercise warrants prior to expiration term		90 days
Minimum conversion price percentage		175.00%
Loss recognized on revalued warrants	$ 1,600	$ 1,800

Preferred Stock and Common Stock Warrants - Assumptions (Details) - Common Stock Warrants	Jun. 30, 2019 Y $ / shares	Dec. 31, 2018 Y $ / shares
Warrants
Stock price	$ 6.32	$ 5.40
Measurement Input, Exercise Price
Warrants
Warrants and Rights Outstanding, Measurement Input	0.01	0.01
Measurement Input, Risk Free Interest Rate
Warrants
Warrants and Rights Outstanding, Measurement Input	1.8	2.5
Measurement Input, Price Volatility
Warrants
Warrants and Rights Outstanding, Measurement Input	27.6	33.1
Measurement Input, Expected Term
Warrants
Warrants and Rights Outstanding, Measurement Input \| Y	2.4	2.7

Preferred Stock and Common Stock Warrants - Beneficial Conversion Feature (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Allocation of net cash proceeds
Gross proceeds				$ 20,945
Net proceeds - Initial Fair Value Allocation				20,945
Series A convertible preferred stock
Allocation of net cash proceeds
Deemed dividends - accretion of beneficial conversion feature - temporary equity	$ 488	$ 551	$ 0	1,000	$ 0
Series A convertible preferred stock \| BCF
Allocation of net cash proceeds
Accretion of stock discount as a deemed dividend				2,500
Series B convertible preferred stock
Allocation of net cash proceeds
Net proceeds - Initial Fair Value Allocation				19,009
Per balance sheet upon issuance				19,009
Series B Warrants
Allocation of net cash proceeds
Net proceeds - Initial Fair Value Allocation				1,936
Per balance sheet upon issuance				$ 1,936

Net Loss Per Share - Basic and Diluted (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Weighted average common shares outstanding:
Basic	107,061	106,398	107,001	106,393
Diluted	107,061	106,398	107,001	106,393
Basic and diluted net loss per share attributable to common stockholders	$ (0.07)	$ (0.03)	$ (0.23)	$ (0.18)

Net Loss Per Share - Anti-Dilutive Securities (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive stock options not considered in computing diluted earnings per common share	26,876	12,499	25,983	12,478
Unvested Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive stock options not considered in computing diluted earnings per common share	605	417	548	396
Shares excluded as performance conditions not yet satisfied	4,100	16,400	4,100	16,400
Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive stock options not considered in computing diluted earnings per common share	12,647		11,891
Common Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive stock options not considered in computing diluted earnings per common share	1,542		1,462
IPO Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive stock options not considered in computing diluted earnings per common share	12,082	12,082	12,082	12,082
Exercise price (per share)	$ 11.50		$ 11.50
Redemption price (per share)			$ 0.01
Number of days of prior notice require to redeem			30 days
Sale price of stock (per share)	$ 17.50		$ 17.50
Number of trading days considered for share price			20 days
Total number of trading days considered			30 days

Share-based Compensation - Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Summary of changes in restricted stock outstanding
Equity awards - share-based compensation	$ (12,972)	$ (1,724)	$ (7,088)	$ 10,716
Liability awards – share-based compensation	(20)	2,179	(20)	2,132
Total share-based compensation expense	(12,992)	455	(7,108)	12,848
Capitalized share-based compensation	(163)	(1,438)	(709)	(1,597)
Total share-based compensation expense	(13,155)	$ (983)	(7,817)	$ 11,251
Share-based compensation liability	182		182			$ 3,018
Additional paid-in-capital	170,374		$ 170,374			180,862
Accounting Standards Update 2018-07 \| Adjustments
Summary of changes in restricted stock outstanding
Share-based compensation liability					$ (2,100)
Additional paid-in-capital					$ 2,100
FID Bonus
Summary of changes in restricted stock outstanding
Percentage of FID bonus to be settled in shares of common stock			110.00%
Share-based compensation liability	$ 200		$ 200			$ 400

Income Taxes - Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Taxes
Income tax provision	$ 0	$ 0	$ 0	$ 0

Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2019 USD ($)
Enterprise Resource Planning
Commitments and Contingencies
Future commitments to be incurred	$ 2.7
Engineering, Procurement and Construction Contract
Commitments and Contingencies
Commitment with the issuance of LNTP	30.3
Value of common stock that can be issued for settlement of commitment	$ 15.0

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Recent Accounting Pronouncements
Operating lease right-of-use assets, net	$ 1,608
Operating lease liability	2,057
Share-based compensation liability	182		$ 3,018
Additional Paid in Capital	$ 170,374		$ 180,862
Accounting Standards Update 2016-02 \| Adjustments
Recent Accounting Pronouncements
Operating lease right-of-use assets, net		$ 1,600
Operating lease liability		1,900
Accounting Standards Update 2018-07 \| Adjustments
Recent Accounting Pronouncements
Share-based compensation liability		(2,100)
Additional Paid in Capital		$ 2,100