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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2018	Aug. 06, 2018
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, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Common Stock Outstanding		108,851,167
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 18,846	$ 35,703
Investments	5,088	5,063
Prepaid expenses and other current assets	2,195	2,099
Total current assets	26,129	42,865
Property, plant and equipment, net	86,060	73,226
Total assets	112,189	116,091
Current liabilities
Accounts payable	623	726
Share-based compensation liability	7,548	1,815
Accrued liabilities and other current liabilities	9,892	5,856
Total current liabilities	18,063	8,397
Non-current compensation liabilities		2,015
Non-current share-based compensation liability		2,587
Total liabilities	18,063	12,999
Commitments and contingencies (Note 9)
Stockholders’ equity
Preferred stock, $0.0001 par value, 1.0 million shares authorized, none issued
Common stock, $0.0001 par value Authorized: 480.0 million shares at June 30, 2018 and December 31, 2017 Issued and outstanding: 106.4 million shares and 106.3 million shares at June 30, 2018 and December 31, 2017, respectively	11	11
Additional paid-in-capital	169,454	158,738
Accumulated deficit	(75,339)	(55,617)
Accumulated other comprehensive loss		(40)
Total stockholders’ equity	94,126	103,092
Total liabilities and stockholders’ equity	$ 112,189	$ 116,091

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Jun. 30, 2018	Dec. 31, 2017
Consolidated Balance Sheets
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	1.0	1.0
Preferred stock, shares issued	0.0	0.0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	480.0	480.0
Common stock, shares issued	106.4	106.3
Common stock, shares outstanding	106.4	106.3

Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operations
Revenues	$ 0	$ 0	$ 0	$ 0
Operating Expenses
General and administrative expenses	3,318	2,227	19,319	4,382
Land option and lease expenses	250	247	500	483
Depreciation expense	48	26	77	52
Total operating expenses	3,616	2,500	19,896	4,917
Total operating loss	(3,616)	(2,500)	(19,896)	(4,917)
Other income (expense)
Interest income, net	131	49	253	86
Other	3	(10)	(39)	(18)
Total other income	134	39	214	68
Net loss	$ (3,482)	$ (2,461)	$ (19,682)	$ (4,849)
Net loss per common share - basic and diluted	$ (0.03)	$ (0.03)	$ (0.18)	$ (0.05)
Weighted average shares outstanding - basic and diluted	106,398	97,723	106,393	96,712
Comprehensive Loss
Net loss	$ (3,482)	$ (2,461)	$ (19,682)	$ (4,849)
Other comprehensive loss:
Change in fair value of investments		(2)		3
Comprehensive loss	$ (3,482)	$ (2,463)	$ (19,682)	$ (4,846)

Consolidated Statement of Stockholders Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total
Increase (decrease) in equity
Adoption of ASU 2016-01 \| Accounting Standards Update 2016-01			$ (40)	$ 40
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				106,300
Increase (decrease) in equity
Share-based compensation		10,716			$ 10,716
Restricted stock vesting	123
Net loss			(19,682)		(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				106,400

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net loss	$ (19,682)	$ (4,849)
Adjustment to reconcile net loss to net cash used in operating activities
Depreciation	77	52
Share-based compensation expense	11,251
Loss on investment securities	25
Changes in operating assets and liabilities:
Prepaid expenses and other currents assets	(96)	114
Accounts payable	(58)	(166)
Accrued expenses and other liabilities	(578)	(204)
Net cash used in operating activities	(9,061)	(5,053)
Investing activities:
Acquisition of property, plant and equipment	(7,746)	(5,584)
Issuance of note receivable		(115)
Repayment of note receivable		5
Investments	(50)	(37)
Net cash used in investing activities	(7,796)	(5,731)
Financing activities:
Proceeds from equity issuance		15,000
Equity issuance costs		(2,567)
Net cash provided by financing activities		12,433
Net (decrease) increase in cash and cash equivalents	(16,857)	1,649
Cash and cash equivalents – beginning of period	35,703	12,524
Cash and cash equivalents – end of period	18,846	14,173
Non-cash investing activities:
Accounts payable for acquisition of property, plant and equipment	453	1,543
Accrued liabilities for acquisition of property, plant and equipment	$ 6,930	3,303
Accrued liability for deferred financing cost		$ 1,079

Background and Basis of Presentation	6 Months Ended
Background and Basis of Presentation	Jun. 30, 2018
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” together with the Terminal, the “Project”). We have also secured, through December 2019, 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, 2017. 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, 2018 are not necessarily indicative of the operating results for the full year. We are an “emerging growth company,” as defined in Section 2(a) of the Securities Act of 1933, as amended (the “Securities Act”), as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). An “emerging growth company” may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. Further, section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period which means that when a standard is issued or revised and it has different application dates for public and private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statements with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards adopted.

Prepaid Expenses and Other Current Assets

6 Months Ended

Jun. 30, 2018

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,
	2018		2017
Rio Grande LNG site option	$	794	$	1,080
Short-term security deposits		367		364
Galveston Bay leases		250		100
Rio Bravo Pipeline options		82		111
Prepaid insurance		84		208
Prepaid marketing and sponsorships		235		55
Deferred equity issuance costs		127		—
Other		256		181
Total prepaid expenses and other current assets	$	2,195	$	2,099

Investment Securities

6 Months Ended

Jun. 30, 2018

Investment Securities

Investment Securities

Note 3 — Investment Securities

The Company maintains cash reserves in the Ultra-Short-Term Bond Fund and the Short-Term Bond Index Fund, which are managed by The Vanguard Group, Inc. The target investment allocation between the Ultra-Short-Term Bond Fund and the Short-Term Bond Index Fund are 75% and 25%, respectively. The Ultra-Short-Term Bond Fund has an average maturity of approximately one year, and approximately 45% of such fund’s holdings are AAA-rated, with 1% non-investment grade rated. The Short-Term Bond Index Fund has an average maturity of approximately three years, and 70% 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,
	2018				2017
	Fair value		Cost		Fair value		Cost
Ultra-Short-Term Bond Fund	$	3,840	$	3,863	$	3,811	$	3,825
Short-Term Bond Index Fund		1,248		1,290		1,252		1,278
Total investments	$	5,088	$	5,153	$	5,063	$	5,103

Property, Plant and Equipment

6 Months Ended

Jun. 30, 2018

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,
	2018		2017
Fixed Assets
Computers	$	115	$	69
Furniture, fixtures, and equipment		289		246
Leasehold improvements		317		264
Total fixed assets		721		579
Less: accumulated depreciation		(448)		(371)
Total fixed assets, net		273		208
Project Assets (not placed in service)
Rio Grande		74,719		62,866
Rio Bravo		11,068		10,152
Total project assets		85,787		73,018
Total property, plant and equipment, net	$	86,060	$	73,226

Depreciation expense for the three and six months ended June 30, 2018 was $48 thousand and $77 thousand, respectively. Depreciation expense for the three and six months ended June 30, 2017 was $26 thousand and $52 thousand, respectively.

Net Loss Per Share

6 Months Ended

Jun. 30, 2018

Net Loss Per Share

Net Loss Per Share

Note 6 — Net Loss Per Share

The following table (in thousands, except for loss per share) reconciles basic and diluted weighted average common shares outstanding for the three and six months ended June 30, 2018 and 2017:


	Three months ended				Six months ended
	June 30,				June 30,
	2018		2017		2018		2017
Weighted average common shares outstanding:
Basic		106,398		97,723		106,393		96,712
Dilutive unvested common stock and common stock warrants		—		—		—		—
Diluted		106,398		97,723		106,393		96,712

Basic and diluted net loss per share	$	(0.03)	$	(0.03)	$	(0.18)	$	(0.05)

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,
	2018		2017		2018		2017
Unvested stock (1)		417		—		396		—
Common stock warrants		12,082		12,059		12,082		12,059
Total dilutive common shares		12,499		12,059		12,478		12,059

⁽¹⁾

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

Share-based Compensation

6 Months Ended

Jun. 30, 2018

Share-based Compensation.

Share-based Compensation

Note 7 — Share-based Compensation

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

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


	Three months ended				Six months ended
	June 30,				June 30,
	2018		2017		2018		2017
Share-based compensation:
Equity awards	$	(1,724)	$	—	$	10,716	$	—
Liability awards		2,179		—		2,132		—
Total share-based compensation		455		—		12,848		—
Capitalized share-based compensation		(1,438)		—		(1,597)		—
Total share-based compensation expense	$	(983)	$	—	$	11,251	$	—

The table below provides a summary of our restricted stock outstanding as of June 30, 2018 and changes during the six months ended June 30, 2018 (in thousands, except per share information):


	Shares		Weighted Average Grant Date Fair Value Per Share
Non-vested at January 1, 2018		9,104	$	10.15
Granted		1,369		7.76
Vested		(123)		8.16
Forfeited		(1,934)		10.20
Non-vested at June 30, 2018		8,416	$	8.95

Certain employee contracts provided for cash bonuses upon a positive final investment decision (“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 $0.8 million is included in share-based compensation liability in our Consolidated Balance Sheets at June 30, 2018.

Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2018

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Note 10 — 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, 2018:


Standard	Description	Expected 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 continue to evaluate the effect of this standard on our Consolidated Financial Statements. Preliminarily, we anticipate a material impact from the requirement to recognize all leases upon our Consolidated Balance Sheets and no impact to cash flows. Because this assessment is preliminary and the accounting for leases is subject to significant judgment, this conclusion could change as we finalize our assessment. We have not yet determined the impact of the adoption of this standard upon our results of operations, whether we will elect to early adopt this standard or which, if any, practical expedients we will elect upon transition.
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	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
Accounting Standards Update (ASU) 2014‑09, Revenue from Contracts with Customers (Topic 606), and subsequent amendments thereto	This standard amends existing revenue recognition guidance and requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard may be early adopted beginning January 1, 2017. We elected to adopt this standard using a full retrospective approach.	January 1, 2018	The adoption of this new standard did not affect the amounts shown in our Consolidated Financial Statements or related disclosures as the Company has no revenues.
ASU 2017‑04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	This standard simplifies the measurement of goodwill impairment by eliminating the requirement for an entity to perform a hypothetical purchase price allocation. An entity will instead measure the impairment as the difference between the carrying amount and the fair value of the reporting unit. This standard may be early adopted beginning January 1, 2017 and must be adopted prospectively.	January 1, 2018	The adoption of this standard did not have a material impact on our Consolidated Financial Statements or related disclosures.
ASU 2016‑16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory	This standard requires the immediate recognition of the tax consequences of intercompany asset transfers other than inventory. This standard may be early adopted, but only at the beginning of an annual period, and must be adopted using a modified retrospective approach.	January 1, 2018	The adoption of this standard did not have a material impact on our Consolidated Financial Statements or related disclosures.
ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	This standard principally affects accounting standards for equity investments, financial liabilities where the fair value option has been elected, and the presentation and disclosure requirements for financial instruments. Upon the effective date of the new standards, all equity investments in unconsolidated entities, other than those accounted for using the equity method of accounting, will generally be measured at fair value through earnings. There will no longer be an available-for-sale classification and therefore, no changes in fair value will be reported in other comprehensive income (loss) for equity securities with readily determinable fair values.	January 1, 2018	Upon the adoption of this standard, we made a cumulative effect adjustment of $40 thousand to accumulated deficit for unrealized losses on our available-for-sale investment securities.

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events
Subsequent Events	Note 11 – Subsequent Events Series A Convertible Preferred Stock Purchase Agreements As previously disclosed, the Company commenced a private offering of convertible preferred equity and warrants (the “Series A Preferred Equity Offering”). In connection with the Series A Preferred Equity Offering, on April 11, 2018, the Company entered into backstop commitment agreements, as amended on August 3, 2018 (as amended, the “Backstop Agreements”) with each of (i) York Capital Management Global Advisors, LLC, severally on behalf of certain funds or accounts managed by it or its affiliates (“York”), (ii) Valinor Management, L.P., severally on behalf of certain funds or accounts for which it is investment manager (“Valinor”), and (iii) Halcyon Capital Management LP, severally on behalf of certain funds or accounts managed by it or its affiliates (“Halcyon” and together with York and Valinor, the “Backstop Purchasers”). On August 3, 2018, the Company entered into a Series A Convertible Preferred Stock Purchase Agreement (collectively, the “Backstop Purchase Agreements”) with each of the Backstop Purchasers, whereby the Company agreed to sell, and York, Valinor and Halcyon each agreed to purchase (the “Backstop Purchaser Offering”), in connection with and pursuant to the Backstop Agreements, approximately $9.9 million, $3.4 million and $1.7 million, respectively, in shares of Series A Convertible Preferred Stock (the “Series A Preferred Stock”) (which include associated warrants). Each Backstop Purchaser is a Company stockholder and, pursuant to that certain Agreement and Plan of Merger, dated as of April 17, 2017, by and among the Company, each Backstop Purchaser and/or one or more of its affiliates, and the other parties named therein, three individuals, two individuals, and one individual from York, Valinor, and Halcyon, respectively, were appointed to the Company’s board of directors (the “Board”). In connection with the closing of the Backstop Purchaser Offering, the Company and the Backstop Purchasers entered into a registration rights agreement that provides the Backstop Purchasers with demand and piggy-back registration rights covering shares of Company common stock and Series A Preferred Stock issued or to be issued under the Backstop Purchase Agreements and the Backstop Agreements. Furthermore, pursuant to warrant agreements issued by the Company to the Backstop Purchasers, the Company issued warrants to the Backstop Parties. The warrants represent the right to acquire approximately 21 basis points (0.21%) in the aggregate of the fully diluted shares of all outstanding shares of Company common stock on the exercise date with a strike price of $0.01 per share. The warrants have a fixed three-year term that commenced on the closing of the issuance of the Series A Preferred Stock and the warrants may only be exercised at the expiration of such three-year term; however, the Company can force exercise of the 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 $13.13 per share. The Backstop Purchaser Offering closed on August 9, 2018. Additionally, on August 3, 2018, the Company and HGC NEXT INV LLC (“HGC”) entered into a Series A Convertible Preferred Stock Purchase Agreement (the “HGC Purchase Agreement”). Pursuant to the HGC Purchase Agreement, the Company agreed to sell, and HGC agreed to purchase (the “HGC Offering”), an aggregate of $35 million of shares of Series A Preferred Stock, together with associated warrants. In connection with, and on the closing of, the HGC Offering, the Company and HGC will enter into a purchaser right agreement (the “Purchaser Rights Agreement”). Pursuant to the Purchaser Rights Agreement, the Company has granted HGC the right to appoint one person to serve on the Board and a right of first refusal to purchase up to an aggregate of $350 million of any equity or equity-linked securities (including, without limitation, preferred equity, combinations of equity and/or any other instruments or forms of equity capital) in connection with the financing of the development, construction, commissioning and/or operation of the Company’s Rio Grande LNG Project, in each case subject to certain exceptions. HGC may transfer such right of first refusal to an affiliate of HGC or Morgan Stanley Infrastructure, Inc. (or an affiliate thereof) without the Company’s consent or to one or more other third parties with the Company’s consent, subject to certain conditions. The appointment of a person by HGC to the Board will result in an increase of the size of the Board from eleven members to twelve members. The HGC Offering is expected to close on or before August 30, 2018.

Prepaid Expenses and Other Current Assets (Tables)

6 Months Ended

Jun. 30, 2018

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,
	2018		2017
Rio Grande LNG site option	$	794	$	1,080
Short-term security deposits		367		364
Galveston Bay leases		250		100
Rio Bravo Pipeline options		82		111
Prepaid insurance		84		208
Prepaid marketing and sponsorships		235		55
Deferred equity issuance costs		127		—
Other		256		181
Total prepaid expenses and other current assets	$	2,195	$	2,099

Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment

Schedule of property, plant and equipment

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


	June 30,		December 31,
	2018		2017
Fixed Assets
Computers	$	115	$	69
Furniture, fixtures, and equipment		289		246
Leasehold improvements		317		264
Total fixed assets		721		579
Less: accumulated depreciation		(448)		(371)
Total fixed assets, net		273		208
Project Assets (not placed in service)
Rio Grande		74,719		62,866
Rio Bravo		11,068		10,152
Total project assets		85,787		73,018
Total property, plant and equipment, net	$	86,060	$	73,226

Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Net Loss Per Share

Schedule of basic and diluted weighted average common shares outstanding

The following table (in thousands, except for loss per share) reconciles basic and diluted weighted average common shares outstanding for the three and six months ended June 30, 2018 and 2017:


	Three months ended				Six months ended
	June 30,				June 30,
	2018		2017		2018		2017
Weighted average common shares outstanding:
Basic		106,398		97,723		106,393		96,712
Dilutive unvested common stock and common stock warrants		—		—		—		—
Diluted		106,398		97,723		106,393		96,712

Basic and diluted net loss per share	$	(0.03)	$	(0.03)	$	(0.18)	$	(0.05)

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,
	2018		2017		2018		2017
Unvested stock (1)		417		—		396		—
Common stock warrants		12,082		12,059		12,082		12,059
Total dilutive common shares		12,499		12,059		12,478		12,059

⁽¹⁾

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

Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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,
	2018		2017		2018		2017
Share-based compensation:
Equity awards	$	(1,724)	$	—	$	10,716	$	—
Liability awards		2,179		—		2,132		—
Total share-based compensation		455		—		12,848		—
Capitalized share-based compensation		(1,438)		—		(1,597)		—
Total share-based compensation expense	$	(983)	$	—	$	11,251	$	—

Summary of changes in restricted stock outstanding

The table below provides a summary of our restricted stock outstanding as of June 30, 2018 and changes during the six months ended June 30, 2018 (in thousands, except per share information):


	Shares		Weighted Average Grant Date Fair Value Per Share
Non-vested at January 1, 2018		9,104	$	10.15
Granted		1,369		7.76
Vested		(123)		8.16
Forfeited		(1,934)		10.20
Non-vested at June 30, 2018		8,416	$	8.95

Recent Accounting Pronouncements (Tables)

6 Months Ended

Jun. 30, 2018

Recent Accounting Pronouncements

Schedule of recent accounting standards not yet adopted


Standard	Description	Expected 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 continue to evaluate the effect of this standard on our Consolidated Financial Statements. Preliminarily, we anticipate a material impact from the requirement to recognize all leases upon our Consolidated Balance Sheets and no impact to cash flows. Because this assessment is preliminary and the accounting for leases is subject to significant judgment, this conclusion could change as we finalize our assessment. We have not yet determined the impact of the adoption of this standard upon our results of operations, whether we will elect to early adopt this standard or which, if any, practical expedients we will elect upon transition.
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	We are currently evaluating the effect of this standard on our Consolidated Financial Statements.

Schedule of recent accounting standards that were adopted

Note 10 — 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, 2018:


Standard	Description	Expected 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 continue to evaluate the effect of this standard on our Consolidated Financial Statements. Preliminarily, we anticipate a material impact from the requirement to recognize all leases upon our Consolidated Balance Sheets and no impact to cash flows. Because this assessment is preliminary and the accounting for leases is subject to significant judgment, this conclusion could change as we finalize our assessment. We have not yet determined the impact of the adoption of this standard upon our results of operations, whether we will elect to early adopt this standard or which, if any, practical expedients we will elect upon transition.
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	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
Accounting Standards Update (ASU) 2014‑09, Revenue from Contracts with Customers (Topic 606), and subsequent amendments thereto	This standard amends existing revenue recognition guidance and requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard may be early adopted beginning January 1, 2017. We elected to adopt this standard using a full retrospective approach.	January 1, 2018	The adoption of this new standard did not affect the amounts shown in our Consolidated Financial Statements or related disclosures as the Company has no revenues.
ASU 2017‑04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	This standard simplifies the measurement of goodwill impairment by eliminating the requirement for an entity to perform a hypothetical purchase price allocation. An entity will instead measure the impairment as the difference between the carrying amount and the fair value of the reporting unit. This standard may be early adopted beginning January 1, 2017 and must be adopted prospectively.	January 1, 2018	The adoption of this standard did not have a material impact on our Consolidated Financial Statements or related disclosures.
ASU 2016‑16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory	This standard requires the immediate recognition of the tax consequences of intercompany asset transfers other than inventory. This standard may be early adopted, but only at the beginning of an annual period, and must be adopted using a modified retrospective approach.	January 1, 2018	The adoption of this standard did not have a material impact on our Consolidated Financial Statements or related disclosures.
ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	This standard principally affects accounting standards for equity investments, financial liabilities where the fair value option has been elected, and the presentation and disclosure requirements for financial instruments. Upon the effective date of the new standards, all equity investments in unconsolidated entities, other than those accounted for using the equity method of accounting, will generally be measured at fair value through earnings. There will no longer be an available-for-sale classification and therefore, no changes in fair value will be reported in other comprehensive income (loss) for equity securities with readily determinable fair values.	January 1, 2018	Upon the adoption of this standard, we made a cumulative effect adjustment of $40 thousand to accumulated deficit for unrealized losses on our available-for-sale investment securities.

Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Prepaid Expenses and Other Current Assets
Rio Grande LNG site option	$ 794	$ 1,080
Short-term security deposits	367	364
Galveston Bay leases	250	100
Rio Bravo Pipeline options	82	111
Prepaid insurance	84	208
Prepaid marketing sponsorships	235	55
Deferred equity issuance costs	127
Other	256	181
Total prepaid expenses and other current assets	$ 2,195	$ 2,099

Investment Securities (Details) - USD ($) $ in Thousands	6 Months Ended
Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment securities
Fair Value	$ 5,088	$ 5,063
Cost	$ 5,153	5,103
Ultra-Short-Term Bond Fund
Investment securities
Target investment allocation (as a percent)	75.00%
Non-investment grade rated holdings (as a percent)	1.00%
Maturity period of mutual funds	1 year
Fair Value	$ 3,840	3,811
Cost	$ 3,863	3,825
Short-Term Bond Index Fund
Investment securities
Target investment allocation (as a percent)	25.00%
Non-investment grade rated holdings (as a percent)	0.00%
Maturity period of mutual funds	3 years
Fair Value	$ 1,248	1,252
Cost	$ 1,290	$ 1,278
AAA rated \| Ultra-Short-Term Bond Fund
Investment securities
Investment holdings grade rated (as a percent)	45.00%
AAA rated \| Short-Term Bond Index Fund
Investment securities
Investment holdings grade rated (as a percent)	70.00%

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment
Total property, plant and equipment, net	$ 86,060		$ 86,060		$ 73,226
Depreciation expense	48	$ 26	77	$ 52
Non project assets
Property, Plant and Equipment
Property, plant and equipment, gross	721		721		579
Less: accumulated depreciation	(448)		(448)		(371)
Total property, plant and equipment, net	273		273		208
Computers
Property, Plant and Equipment
Property, plant and equipment, gross	115		115		69
Furniture, fixtures, and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	289		289		246
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	317		317		264
Project assets
Property, Plant and Equipment
Project assets in progress	85,787		85,787		73,018
Rio Grande
Property, Plant and Equipment
Project assets in progress	74,719		74,719		62,866
Rio Bravo
Property, Plant and Equipment
Project assets in progress	$ 11,068		$ 11,068		$ 10,152

Accrued Liabilities and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accrued Liabilities and Other Current Liabilities
Employee compensation expense	$ 2,389	$ 1,851
Project asset costs	6,930	3,317
Accrued legal services	140	141
Other accrued liabilities	433	547
Total accrued liabilities and other current liabilities	$ 9,892	$ 5,856

Share-based Compensation - Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Summary of changes in restricted stock outstanding
Total share-based compensation	$ 455	$ 12,848
Capitalized share-based compensation	(1,438)	(1,597)
Total share-based compensation expense	(983)	11,251
Weighted Average Grant Date Fair Value Per Share
Share-based compensation liability	7,548	7,548	$ 1,815
Equity awards
Summary of changes in restricted stock outstanding
Total share-based compensation expense	(1,724)	10,716
Liability awards
Summary of changes in restricted stock outstanding
Total share-based compensation expense	$ 2,179	$ 2,132
Restricted stock
Shares
Non-vested at beginning of the year (in shares)		9,104
Granted (in shares)		1,369
Vested (in shares)		(123)
Forfeited (in shares)		(1,934)
Non-vested at end of the year (in shares)	8,416	8,416
Weighted Average Grant Date Fair Value Per Share
Non-vested at beginning of the year (in dollars per share)		$ 10.15
Granted (in dollars per share)		7.76
Vested (in dollars per share)		8.16
Forfeited (in dollars per share)		10.20
Non-vested at end of the year (in dollars per share)	$ 8.95	$ 8.95
FID Bonus
Weighted Average Grant Date Fair Value Per Share
Percentage of FID bonus to be settled in shares of common stock		110.00%
Share-based compensation liability	$ 800	$ 800

Commitments and Contingencies - Leases and Land Options (Details) - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2018	Apr. 30, 2018
Commitments and Contingencies
Term of lease agreement	24 months
Remaining commitments
Remainder of 2018	$ 0.0
2019	0.7
2020	$ 0.9
Intrastate Pipeline Company
Commitments and Contingencies
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

Subsequent Events (Details) - Subsequent Events		1 Months Ended
Subsequent Events (Details) - Subsequent Events	Aug. 03, 2018 USD ($) director individual $ / shares	Aug. 31, 2018 director
Subsequent Events
Number of members on the Company's board of directors \| director	11
Forecast
Subsequent Events
Number of members on the Company's board of directors \| director		12
Backstop Agreements
Subsequent Events
Basis of acquired diluted common stock - warrants rights (as a percent)	0.21%
Strike price of warrants (in dollars per share) \| $ / shares	$ 0.01
Fixed term to hold warrant prior to exercise	3 years
Number of specified trading days within the prior 90 trading days the volume weighted average trading price of shares must equal or exceed the price trigger	60 days
Number of consecutive trading days within which the volume weighted average trading price of shares must equal or exceed the trigger for the specified number of trading days	90 days
Volume weighted average trading price of shares of Company common stock that must be attained or exceeded for the threshold number of trading days of the prior 90 trading days	$ 13.13
Backstop Agreements \| York Group
Subsequent Events
Number of individuals appointed to the Company's board of directors \| individual	3
Backstop Agreements \| York Group \| Series A Convertible Preferred Stock
Subsequent Events
Purchase value commitment of shares, including warrants	$ 9,900,000
Backstop Agreements \| Valinor Group
Subsequent Events
Number of individuals appointed to the Company's board of directors \| individual	2
Backstop Agreements \| Valinor Group \| Series A Convertible Preferred Stock
Subsequent Events
Purchase value commitment of shares, including warrants	$ 3,400,000
Backstop Agreements \| Halcyon Group
Subsequent Events
Number of individuals appointed to the Company's board of directors \| individual	1
Backstop Agreements \| Halcyon Group \| Series A Convertible Preferred Stock
Subsequent Events
Purchase value commitment of shares, including warrants	$ 1,700,000
HGC Purchase Agreement \| HGC
Subsequent Events
Number of individuals that may be appointed to the Company's board of directors \| individual	1
HGC Purchase Agreement \| HGC \| Maximum
Subsequent Events
Aggregate amount of equity or equity-linked securities that may be purchased under right of first refusal	$ 350,000,000
HGC Purchase Agreement \| HGC \| Series A Convertible Preferred Stock
Subsequent Events
Purchase value commitment of shares, including warrants	$ 35,000,000

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2018
Income Taxes
Income Taxes	Note 8 — Income Taxes Due to our cumulative loss position, we have established a full valuation allowance against our deferred tax assets at June 30, 2018 and December 31, 2017. Due to NextDecade LLC’s previous pass-through status and our full valuation allowance, we have not recorded a provision for federal or state income taxes during the three and six months ended June 30, 2018 and 2017.

Nature of Operations and Basis of Presentation (Details)	6 Months Ended
	Jun. 30, 2018 a mi
Organization and Nature of Operations
Length of pipeline to supply gas \| mi	137
Galveston Bay Leases
Organization and Nature of Operations
Area available for lease \| a	994

Recent Accounting Pronouncements (Details) $ in Thousands	Jan. 01, 2018 USD ($)
Accounting Standards Update 2016-01 \| Adjustment
Recent Accounting Pronouncements
Cumulative effect on retained earnings	$ (40)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Taxes
Income tax provision	$ 0	$ 0	$ 0	$ 0