0001437749-21-007153 | 10-K | XBRL Viewer

Significant Accounting Policies [Text Block]

Note 2 — Summary of Significant Accounting Policies

Use of Estimates

The preparation of Consolidated Financial Statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and the accompanying notes. Management evaluates its estimates and related assumptions regularly, including those related to the value of property, plant and equipment, income taxes including valuation allowances for net deferred tax assets, share-based compensation and fair value measurements. Changes in facts and circumstances or additional information may result in revised estimates, and actual results may differ from these estimates.

Concentrations of Credit Risk

Financial instruments that potentially subject us to a concentration of credit risk consist principally of cash and cash equivalents. We maintain cash balances with a single financial institution, which may at times be in excess of federally insured levels. We have not incurred losses related to these cash and cash equivalent balances to date.

Cash Equivalents

We consider all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents.

Investment Securities

We define investment securities as investments in marketable securities that can be readily converted to cash. We determine the appropriate classification of investment securities at the time of purchase and reevaluate such classification at each balance sheet date. Investment securities are initially recorded at cost and remeasured to fair value, with changes presented in other income in our Consolidated Statements of Operations.

Property, Plant and Equipment

Generally, we begin to capitalize the costs of our development projects once construction of the individual project is probable. This assessment includes the following criteria:

•

funding for design and permitting has been identified and is expected in the near-term;

•

key vendors for development activities have been identified, and we expect to engage them at commercially reasonable terms;

•

we have committed to commencing development activities;

•

regulatory approval is probable;

•

construction financing is expected to be available at the time of a final investment decision (“FID”);

•

prospective customers have been identified and the FID is probable; and

•

receipt of customary local tax incentives, as needed for project viability, is probable.

Prior to meeting the criteria above, costs associated with a project are expensed as incurred. Expenditures for normal repairs and maintenance are expensed as incurred.

When assets are retired or disposed, the cost and accumulated depreciation are eliminated from the accounts and any gain or loss is reflected in our Consolidated Statements of Operations.

Property, plant and equipment is carried at historical cost and depreciated using the straight-line method over their estimated useful lives.

Leasehold improvements are depreciated over the lesser of the economic life of the leasehold improvement or the term of the lease, without regard to extension/renewal rights.

Management tests property, plant and equipment for impairment whenever events or changes in circumstances have indicated that the carrying amount of property, plant and equipment might not be recoverable. Assets are grouped at the lowest level for which there are identifiable cash flows that are largely independent of the cash flows of other groups of assets for purposes of assessing recoverability. Recoverability generally is determined by comparing the carrying value of the asset to the expected undiscounted future cash flows of the asset. If the carrying value of the asset is not recoverable, the amount of impairment loss is measured as the excess, if any, of the carrying value of the asset over its estimated fair value.

Warrants

The Company determines the accounting classification of warrants that are issued, as either liability or equity, by first assessing whether the warrants meet liability classification in accordance with Accounting Standards Codification (“ASC”) 480 Distinguishing Liabilities from Equity (“ASC 480”), and then in accordance with ASC 815-40, Accounting for Derivative Financial Instruments Indexed to, and Potentially Settled in, a Company’s Own Stock (“ASC 815-40”). Under ASC 480, warrants are considered liability classified if the warrants are mandatorily redeemable, obligate the issuer to settle the warrants or the underlying shares by paying cash or other assets, or warrants that must or may require settlement by issuing a variable number of shares.

If warrants do not meet liability classification under ASC 480, the Company assesses the requirements under ASC 815-40, which states that contracts that require or may require the issuer to settle the contract for cash or a variable number of shares are liabilities recorded at fair value, irrespective of the likelihood of the transaction occurring that triggers the net cash settlement feature. If the warrants do not require liability classification under ASC 815-40, in order to conclude equity classification, the Company assesses whether the warrants are indexed to our common stock and whether the warrants are classified as equity under ASC 815-40 or other applicable GAAP. After all relevant assessments are made, the Company concludes whether the warrants are classified as liability or equity. Liability classified warrants are required to be accounted for at fair value both on the date of issuance and on subsequent accounting period ending dates, with all changes in fair value after the issuance date recorded in the statements of operations as a gain or loss. Equity classified warrants are accounted for at fair value on the issuance date with no changes in fair value recognized after the issuance date.

Fair Value of Financial Instruments

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Hierarchy Levels 1, 2 and 3 are terms for the priority of inputs to valuation techniques used to measure fair value. Hierarchy Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Hierarchy Level 2 inputs are inputs other than quoted prices included within Level 1 that are directly or indirectly observable for the asset or liability. Hierarchy Level 3 inputs are inputs that are not observable in the market. In determining fair value, we use observable market data when available, or models that incorporate observable market data. In addition to market information, we incorporate transaction-specific details that, in management’s judgment, market participants would take into account in measuring fair value. We maximize the use of observable inputs and minimize our use of unobservable inputs in arriving at fair value estimates. Recurring fair-value measurements are performed for investment securities as disclosed in Note 4 – Investment Securities and for Common Stock Warrant liabilities as disclosed in Note 10 – Preferred Stock and Common Stock Warrants. The carrying amount of cash and cash equivalents and accounts payable reported on the Consolidated Balance Sheets approximates fair value due to their short-term maturities.

Treasury Stock

Treasury stock is recorded at cost. Issuance of treasury stock is accounted for on a weighted average cost basis. Differences between the cost of treasury stock and the re-issuance proceeds are charged to additional paid-in capital.

Net Loss Per Share

Net loss per share (“EPS”) is computed in accordance with GAAP. Basic EPS excludes dilution and is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted EPS reflects potential dilution and is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period increased by the number of additional common shares that would have been outstanding if the potential common shares had been issued and were dilutive. The dilutive effect of unvested stock and warrants is calculated using the treasury-stock method and the dilutive effect of convertible securities is calculated using the if-converted method. Basic and diluted EPS for all periods presented are the same since the effect of our potentially dilutive securities are anti-dilutive to our net loss per share, as disclosed in Note 11 – Net Loss Per Share Attributable to Common Stockholders.

Share-based Compensation

We recognize share-based compensation at fair value on the date of grant. The fair value is recognized as expense (net of any capitalization) over the requisite service period. For equity-classified share-based compensation awards, compensation cost is recognized based on the grant-date fair value using the quoted market price of our common stock and not subsequently remeasured. The fair value is recognized as expense, net of any capitalization, using the straight-line basis for awards that vest based on service conditions and using the graded-vesting attribution method for awards that vest based on performance conditions. We estimate the service periods for performance awards utilizing a probability assessment based on when we expect to achieve the performance conditions. For liability classified share-based compensation awards, compensation cost is initially recognized on the grant date using estimated payout levels. Compensation cost is subsequently adjusted quarterly to reflect the updated estimated payout levels based on the changes in our stock price. We account for forfeitures as they occur.

Income Taxes

Provisions for income taxes are based on taxes payable or refundable for the current year and deferred taxes on temporary differences between the tax basis of assets and liabilities and their reported amounts in the Consolidated Financial Statements. Deferred tax assets and liabilities are included in the Consolidated Financial Statements at currently enacted income tax rates applicable to the period in which the deferred tax assets and liabilities are expected to be realized or settled. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the current period’s provision for income taxes. A valuation allowance is recorded to reduce the carrying value of our net deferred tax assets when it is more likely than not that a portion or all of the deferred tax assets will expire before realization of the benefit or future deductibility is not probable. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the tax position.

Smaller Reporting Company

Under Rule 12b-2 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), the Company qualifies as a “smaller reporting company” because the value of its common stock held by non-affiliates as of the end of its most recently completed second fiscal quarter was less than $250 million. For as long as the Company remains a smaller reporting company, it may take advantage of certain exemptions from the SEC’s reporting requirements that are otherwise applicable to public companies that are not smaller reporting companies.

Note 3 - Prepaid Expenses and Other Current Assets

12 Months Ended

Dec. 31, 2020

Prepaid Expense and Other Current Assets [Text Block]

Note 3 — Prepaid Expenses and Other Current Assets

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

	*December 31,*		*December 31,*
	*2020*		*2019*
Prepaid subscriptions	$	29	$	161
Prepaid insurance		314		292
Prepaid marketing and sponsorships		60		25
Other		267		381
Total prepaid expenses and other current assets	$	670	$	859

Note 4 - Investment Securities

12 Months Ended

Dec. 31, 2020

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

Note 4 — Investment Securities

We previously invested in Class L shares of the JPMorgan Managed Income Fund. In March 2020, we redeemed the balance of the JPMorgan Managed Income Fund and realized a loss of $0.4 million.

Investment securities are included in Level 1 of the fair value hierarchy and consisted of the following (in thousands):

	*December 31,*				*December 31,*
	*2020*				*2019*
	*Fair value*		*Cost*		*Fair value*		*Cost*
JPMorgan Managed Income Fund	$	—	$	—	$	62,207	$	6,278

Note 5 - Sale of Equity Interests in Rio Bravo Pipeline Company, LLC

12 Months Ended

Dec. 31, 2020

Equity Method Investments and Joint Ventures Disclosure [Text Block]

Note 5 — Sale of Equity Interests in Rio Bravo Pipeline Company, LLC

On March 2, 2020, NextDecade LLC closed the transactions (the “Closing”) contemplated by that certain Omnibus Agreement, dated February 13, 2020, with Spectra Energy Transmission II, LLC, a wholly owned subsidiary of Enbridge Inc. (“Buyer”), pursuant to which NextDecade LLC sold one hundred percent of the equity interests (the “Equity Interests”) in Rio Bravo Pipeline Company, LLC (“Rio Bravo”) to Buyer for consideration of approximately $19.4 million. Buyer paid $15.0 million of the purchase price to NextDecade LLC at the Closing and the remainder will be paid within five business days after the date that Rio Grande has received, after a final positive investment decision, the initial funding of financing for the development, construction and operation of the Terminal. In connection with the Closing, Rio Grande LNG Gas Supply LLC, an indirect wholly-owned subsidiary of the Company (“Rio Grande Gas Supply”), entered into (i) a Precedent Agreement for Firm Natural Gas Transportation Service for the Rio Bravo Pipeline (the “RBPL Precedent Agreement”) with Rio Bravo and (ii) a Precedent Agreement for Natural Gas Transportation Service (the “VCP Precedent Agreement”) with Valley Crossing Pipeline, LLC (“VCP”). VCP and, as of the Closing, Rio Bravo are wholly owned subsidiaries of Enbridge Inc. The Valley Crossing Pipeline is owned and operated by VCP.

Pursuant to the RBPL Precedent Agreement, Rio Bravo agreed to provide Rio Grande Gas Supply with firm natural gas transportation services on the Pipeline in a quantity sufficient to match the full operational capacity of each proposed liquefaction train of the Terminal. Rio Bravo’s obligation to construct, install, own, operate and maintain the Pipeline is conditioned on its receipt, no later than December 31, 2023, of notice that Rio Grande Gas Supply or its affiliate has issued a full notice to proceed to the engineering, procurement and construction contractor (the “EPC Contractor”) for the construction of the Terminal. Under the RBPL Precedent Agreement, in consideration for the provision of such firm transportation services, Rio Bravo will be remunerated on a dollar-per-dekatherm, take-or-pay basis, subject to certain adjustments, over a term of at least twenty years, all in compliance with the federal and state authorizations associated with the Pipeline.

Pursuant to the VCP Precedent Agreement, VCP agreed to provide Rio Grande Gas Supply with natural gas transportation services on the Valley Crossing Pipeline in a quantity sufficient to match the commissioning requirements of each proposed liquefaction train of the Terminal. VCP’s obligation to construct, install, own, operate and maintain the necessary interconnection to the Terminal and the Pipeline is conditioned on its receipt, no later than December 31, 2023, of notice that Rio Grande Gas Supply or its affiliate has issued a full notice to proceed to the EPC Contractor for the construction of the Terminal. VCP will be responsible, at its sole cost and expense, to construct, install, own, operate and maintain the tap, riser and valve facilities (the “VCP Transporter Facilities”), which shall connect to Rio Grande Gas Supply’s custody transfer meter and such other facilities as necessary in order for the Terminal to receive gas from the VCP Transporter Facilities (the “Rio Grande Gas Supply Facilities”). Rio Grande Gas Supply will be responsible, at its sole cost and expense, to construct, install, own, operate and maintain the Rio Grande Gas Supply Facilities. Under the VCP Precedent Agreement, in consideration for the provision of the commissioning transportation services, VCP will be remunerated on the same dollar-per-dekatherm, take-or-pay basis as set forth in the RBPL Precedent Agreement for the duration of such commissioning services, all in compliance with the federal and state authorizations associated with the Valley Crossing Pipeline.

If Rio Grande or its affiliate fail to issue a full notice to proceed to the EPC Contractor on or prior to December 31, 2023, Buyer has the right to sell the Equity Interests back to NextDecade LLC and NextDecade LLC has the right to repurchase the Equity Interests from Buyer, in each case at a price not to exceed $23 million. Accordingly, the proceeds from the sale of the Equity Interests and additional costs incurred by Buyer are presented as a non-current liability and the assets of Rio Bravo have not been de-recognized in the consolidated balance sheet at December 31, 2020.

Note 6 - Property, Plant and Equipment

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment Disclosure [Text Block]

Note 6 — Property, Plant and Equipment

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

	*December 31,*			*December 31,*
	*2020*			*2019*
Fixed Assets
Computers	$	487		$	487
Furniture, fixtures, and equipment		464			471
Leasehold improvements		101			547
Total fixed assets		1,052			1,505
Less: accumulated depreciation		(660	)		(793	)
Total fixed assets, net		392			712
Terminal and Pipeline Assets (not placed in service)
Terminal		140,253			121,081
Pipeline		21,017			12,798
Total Terminal and Pipeline assets		161,270			133,879
Total property, plant and equipment, net	$	161,662		$	134,591

Depreciation expense for the years ended December 31, 2020 and 2019 was $196 thousand and $251 thousand, respectively.

Note 8 - Other Non-current Assets

12 Months Ended

Dec. 31, 2020

Other Assets Disclosure [Text Block]

Note 8 — Other Non-Current Assets

Other non-current assets consisted of the following (in thousands):	*December 31,*		*December 31,*
	*2020*		*2019*
Permitting costs⁽¹⁾	$	7,385	$	2,637
Enterprise resource planning system, net		1,805		3,165
Rio Grande Site Lease initial direct costs		7,109		946
Total other non-current assets, net	$	16,299	$	6,748

⁽¹⁾

Permitting costs primarily represent costs incurred in connection with our permit applications to the United States Army Corps of Engineers and the U.S. Fish and Wildlife Service for wetlands and habitat mitigation measures for potential impacts to wetlands and habitat that may be caused by the construction of the Terminal.

Note 9 - Accrued Liabilities and Other Current Liabilities

12 Months Ended

Dec. 31, 2020

Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]

Note 9 — Accrued Liabilities and Other Current Liabilities

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

	*December 31,*		*December 31,*
	*2020*		*2019*
Employee compensation expense	$	14	$	4,221
Terminal and Pipeline asset costs		650		2,503
Accrued legal services		5		1,060
Other accrued liabilities		363		967
Total accrued liabilities and other current liabilities	$	1,032	$	8,751

Note 13 - Income Taxes

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Text Block]

Note 13 — Income Taxes

The reconciliation of the federal statutory income tax rate to our effective income tax rate is as follows:

	*Year Ended*
	*December 31,*
	*2020*			*2019*
U.S. federal statutory rate, beginning of year		21	%		21	%
Officers' compensation		2			7
Other		(3	)		(2	)
Valuation allowance		(20	)		(26	)
Effective tax rate as reported		—	%		—	%

Significant components of our deferred tax assets and liabilities at December 31, 2020 and 2019 are as follows (in thousands):

	*Year Ended*
	*December 31,*
	*2020*			*2019*
Deferred tax assets
Net operating loss carryforwards and credits	$	20,698		$	15,064
Share-based compensation expense		3,813			3,441
Property, plant and equipment		725			1,025
Common stock warrant liabilities		—			524
Operating lease liabilities		91			147
Other		54			21
Less: valuation allowance		(22,669	)		(19,802	)
Total deferred tax assets		2,712			420

Deferred tax liabilities
Common stock warrant liabilities		(1,129	)		—
Operating lease Right-of-use assets		(1,583	)		(420	)
Total deferred tax liabilities		(2,712	)		(420	)

Net deferred tax assets (liabilities)	$	—		$	—

The federal deferred tax assets presented above do not include the state tax benefits as our net deferred state tax assets are offset with a full valuation allowance.

At December 31, 2020, we had federal net operating loss (“NOL”) carryforwards of approximately $98.6 million. Approximately $26.1 million of these NOL carryforwards will expire between 2034 and 2038.

Due to our history of NOLs, current year NOLs and significant risk factors related to our ability to generate taxable income, we have established a valuation allowance to offset our deferred tax assets as of December 31, 2020 and 2019. We will continue to evaluate our ability to release the valuation allowance in the future. Due to our full valuation allowance, we have not recorded a provision for federal or state income taxes during the years ended December 31, 2020 or 2019. Deferred tax assets and deferred tax liabilities are classified as non-current in our Consolidated Balance Sheets.

The Tax Reform Act of 1986 (as amended) contains provisions that limit the utilization of NOL and tax credit carryforwards if there has been a change in ownership as described in Section 382 of the Internal Revenue Code (“Section 382”). Substantial changes in the Company's ownership have occurred that may limit or reduce the amount of NOL carryforwards that the Company could utilize in the future to offset taxable income. The Company has not completed a detailed Section 382 study at this time to determine what impact, if any, that ownership changes may have had on its NOL carryforwards. In each period since its inception, the Company has recorded a valuation allowance for the full amount of its deferred tax assets, as the realization of the deferred tax asset is uncertain. As a result, the Company has not recognized any federal or state income tax benefit in its Consolidated Statement of Operations.

We remain subject to periodic audits and reviews by taxing authorities; however, we did not have any open income tax audits as of December 31, 2020. The federal tax returns for the years beginning 2015 remain open for examination.

In response to the global pandemic related to COVID-19, the President signed into law the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) on March 27, 2020 and the Consolidated Appropriations Act, 2021 (the “CAA”) on December 27, 2020. The CARES Act and the CAA provide numerous relief provisions for corporate taxpayers, including modification of the utilization limitations on NOLs, favorable expansions of the deduction for business interest expense under Internal Revenue Code Section 163(j), and the ability to accelerate timing of refundable alternative minimum tax credits. For the year ended December 31, 2020, there were no material tax impacts to our consolidated financial statements from the CARES Act, the CAA or other COVID-19 measures. The Company continues to monitor additional guidance issued by the U.S. Treasury Department, the Internal Revenue Service and others.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Note 15 - Recent Accounting Pronouncements

12 Months Ended

Dec. 31, 2020

Accounting Standards Update and Change in Accounting Principle [Text Block]

Note 15 — Recent Accounting Pronouncements

The following table provides a brief description of recent accounting standards that have not been adopted by the Company during the reporting period:

Standard		Description		Date of Adoption		Effect on our Consolidated Financial Statements or Other Significant Matters
ASU 2020-06, Accounting for Convertible Instruments and Contracts in Entity's Own Equity (Subtopic 815-40)		This standard requires entities to provide expanded disclosures about the terms and features of convertible instruments. For convertible instruments, the instruments primarily affected are those issued with beneficial conversion features or cash conversion features because the accounting models for those specific features are removed.		January 1, 2022		We are currently evaluating the effect of this standard on our Consolidated Financial Statements.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

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Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(3)

+ Details

Note 16 - Subsequent Events

12 Months Ended

Dec. 31, 2020

Subsequent Events [Text Block]

Note 16 — Subsequent Events

On March 17, 2021, the Company entered into a Series C Convertible Preferred Stock Purchase Agreement (collectively, the “Series C Stock Purchase Agreements”) with each of (i) York Capital Management, L.P. and certain of its affiliates (“York”), (ii) certain affiliates of Bardin Hill Investment Partners LP (“Bardin Hill”), and (iii) Avenue Energy Opportunities Fund II, L.P (“Avenue” and together with York and Bardin Hill, the “Purchasers”) pursuant to which the Company agreed to sell, and the Purchasers agreed to purchase shares of the Company’s Series C Convertible Preferred Stock, par value $0.0001 per share (the “Series C Preferred Stock”), together with associated warrants, for an aggregate purchase price of $24.5 million. The consummation of the transactions contemplated by the Series C Stock Purchase Agreements occurred at multiple closings on or prior to March 22, 2021.

We have evaluated subsequent events through March 25, 2021, the date the financial statements were issued. Any material subsequent events that occurred during this time have been properly recognized and/or disclosed in these financial statements.

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

Concentration Risk, Credit Risk, Policy [Policy Text Block]

Concentrations of Credit Risk

Financial instruments that potentially subject us to a concentration of credit risk consist principally of cash and cash equivalents. We maintain cash balances with a single financial institution, which may at times be in excess of federally insured levels. We have not incurred losses related to these cash and cash equivalent balances to date.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash Equivalents

We consider all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents.

Investment, Policy [Policy Text Block]

Investment Securities

We define investment securities as investments in marketable securities that can be readily converted to cash. We determine the appropriate classification of investment securities at the time of purchase and reevaluate such classification at each balance sheet date. Investment securities are initially recorded at cost and remeasured to fair value, with changes presented in other income in our Consolidated Statements of Operations.

Property, Plant and Equipment, Policy [Policy Text Block]

Property, Plant and Equipment

Generally, we begin to capitalize the costs of our development projects once construction of the individual project is probable. This assessment includes the following criteria:

•

funding for design and permitting has been identified and is expected in the near-term;

•

key vendors for development activities have been identified, and we expect to engage them at commercially reasonable terms;

•

we have committed to commencing development activities;

•

regulatory approval is probable;

•

construction financing is expected to be available at the time of a final investment decision (“FID”);

•

prospective customers have been identified and the FID is probable; and

•

receipt of customary local tax incentives, as needed for project viability, is probable.

Prior to meeting the criteria above, costs associated with a project are expensed as incurred. Expenditures for normal repairs and maintenance are expensed as incurred.

When assets are retired or disposed, the cost and accumulated depreciation are eliminated from the accounts and any gain or loss is reflected in our Consolidated Statements of Operations.

Property, plant and equipment is carried at historical cost and depreciated using the straight-line method over their estimated useful lives.

Leasehold improvements are depreciated over the lesser of the economic life of the leasehold improvement or the term of the lease, without regard to extension/renewal rights.

Management tests property, plant and equipment for impairment whenever events or changes in circumstances have indicated that the carrying amount of property, plant and equipment might not be recoverable. Assets are grouped at the lowest level for which there are identifiable cash flows that are largely independent of the cash flows of other groups of assets for purposes of assessing recoverability. Recoverability generally is determined by comparing the carrying value of the asset to the expected undiscounted future cash flows of the asset. If the carrying value of the asset is not recoverable, the amount of impairment loss is measured as the excess, if any, of the carrying value of the asset over its estimated fair value.

Warrants [Policy Text Block]

Warrants

The Company determines the accounting classification of warrants that are issued, as either liability or equity, by first assessing whether the warrants meet liability classification in accordance with Accounting Standards Codification (“ASC”) 480 Distinguishing Liabilities from Equity (“ASC 480”), and then in accordance with ASC 815-40, Accounting for Derivative Financial Instruments Indexed to, and Potentially Settled in, a Company’s Own Stock (“ASC 815-40”). Under ASC 480, warrants are considered liability classified if the warrants are mandatorily redeemable, obligate the issuer to settle the warrants or the underlying shares by paying cash or other assets, or warrants that must or may require settlement by issuing a variable number of shares.

If warrants do not meet liability classification under ASC 480, the Company assesses the requirements under ASC 815-40, which states that contracts that require or may require the issuer to settle the contract for cash or a variable number of shares are liabilities recorded at fair value, irrespective of the likelihood of the transaction occurring that triggers the net cash settlement feature. If the warrants do not require liability classification under ASC 815-40, in order to conclude equity classification, the Company assesses whether the warrants are indexed to our common stock and whether the warrants are classified as equity under ASC 815-40 or other applicable GAAP. After all relevant assessments are made, the Company concludes whether the warrants are classified as liability or equity. Liability classified warrants are required to be accounted for at fair value both on the date of issuance and on subsequent accounting period ending dates, with all changes in fair value after the issuance date recorded in the statements of operations as a gain or loss. Equity classified warrants are accounted for at fair value on the issuance date with no changes in fair value recognized after the issuance date.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Hierarchy Levels 1, 2 and 3 are terms for the priority of inputs to valuation techniques used to measure fair value. Hierarchy Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Hierarchy Level 2 inputs are inputs other than quoted prices included within Level 1 that are directly or indirectly observable for the asset or liability. Hierarchy Level 3 inputs are inputs that are not observable in the market. In determining fair value, we use observable market data when available, or models that incorporate observable market data. In addition to market information, we incorporate transaction-specific details that, in management’s judgment, market participants would take into account in measuring fair value. We maximize the use of observable inputs and minimize our use of unobservable inputs in arriving at fair value estimates. Recurring fair-value measurements are performed for investment securities as disclosed in Note 4 – Investment Securities and for Common Stock Warrant liabilities as disclosed in Note 10 – Preferred Stock and Common Stock Warrants. The carrying amount of cash and cash equivalents and accounts payable reported on the Consolidated Balance Sheets approximates fair value due to their short-term maturities.

Treasury Stock [Policy Text Block]

Treasury Stock

Treasury stock is recorded at cost. Issuance of treasury stock is accounted for on a weighted average cost basis. Differences between the cost of treasury stock and the re-issuance proceeds are charged to additional paid-in capital.

Earnings Per Share, Policy [Policy Text Block]

Net Loss Per Share

Net loss per share (“EPS”) is computed in accordance with GAAP. Basic EPS excludes dilution and is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted EPS reflects potential dilution and is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period increased by the number of additional common shares that would have been outstanding if the potential common shares had been issued and were dilutive. The dilutive effect of unvested stock and warrants is calculated using the treasury-stock method and the dilutive effect of convertible securities is calculated using the if-converted method. Basic and diluted EPS for all periods presented are the same since the effect of our potentially dilutive securities are anti-dilutive to our net loss per share, as disclosed in Note 11 – Net Loss Per Share Attributable to Common Stockholders.

Share-based Payment Arrangement [Policy Text Block]

Share-based Compensation

We recognize share-based compensation at fair value on the date of grant. The fair value is recognized as expense (net of any capitalization) over the requisite service period. For equity-classified share-based compensation awards, compensation cost is recognized based on the grant-date fair value using the quoted market price of our common stock and not subsequently remeasured. The fair value is recognized as expense, net of any capitalization, using the straight-line basis for awards that vest based on service conditions and using the graded-vesting attribution method for awards that vest based on performance conditions. We estimate the service periods for performance awards utilizing a probability assessment based on when we expect to achieve the performance conditions. For liability classified share-based compensation awards, compensation cost is initially recognized on the grant date using estimated payout levels. Compensation cost is subsequently adjusted quarterly to reflect the updated estimated payout levels based on the changes in our stock price. We account for forfeitures as they occur.

Income Tax, Policy [Policy Text Block]

Income Taxes

Provisions for income taxes are based on taxes payable or refundable for the current year and deferred taxes on temporary differences between the tax basis of assets and liabilities and their reported amounts in the Consolidated Financial Statements. Deferred tax assets and liabilities are included in the Consolidated Financial Statements at currently enacted income tax rates applicable to the period in which the deferred tax assets and liabilities are expected to be realized or settled. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the current period’s provision for income taxes. A valuation allowance is recorded to reduce the carrying value of our net deferred tax assets when it is more likely than not that a portion or all of the deferred tax assets will expire before realization of the benefit or future deductibility is not probable. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the tax position.

Smaller Reporting Company [Policy Text Block]

Smaller Reporting Company

Under Rule 12b-2 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), the Company qualifies as a “smaller reporting company” because the value of its common stock held by non-affiliates as of the end of its most recently completed second fiscal quarter was less than $250 million. For as long as the Company remains a smaller reporting company, it may take advantage of certain exemptions from the SEC’s reporting requirements that are otherwise applicable to public companies that are not smaller reporting companies.

Note 3 - Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of Prepaid Expense and Other Current Assets [Table Text Block]

	*December 31,*		*December 31,*
	*2020*		*2019*
Prepaid subscriptions	$	29	$	161
Prepaid insurance		314		292
Prepaid marketing and sponsorships		60		25
Other		267		381
Total prepaid expenses and other current assets	$	670	$	859

Note 4 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2020

Debt Securities, Available-for-sale [Table Text Block]

	*December 31,*				*December 31,*
	*2020*				*2019*
	*Fair value*		*Cost*		*Fair value*		*Cost*
JPMorgan Managed Income Fund	$	—	$	—	$	62,207	$	6,278

Note 6 - Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Table Text Block]

	*December 31,*			*December 31,*
	*2020*			*2019*
Fixed Assets
Computers	$	487		$	487
Furniture, fixtures, and equipment		464			471
Leasehold improvements		101			547
Total fixed assets		1,052			1,505
Less: accumulated depreciation		(660	)		(793	)
Total fixed assets, net		392			712
Terminal and Pipeline Assets (not placed in service)
Terminal		140,253			121,081
Pipeline		21,017			12,798
Total Terminal and Pipeline assets		161,270			133,879
Total property, plant and equipment, net	$	161,662		$	134,591

Note 7 - Leases (Tables)

12 Months Ended

Dec. 31, 2020

Lessee, Operating Lease Right-of-use Assets and Liabilities [Table Text Block]

		*December 31,*		*December 31,*
		*2020*		*2019*
Office leases	$	429	$	610
Land leases		—		444
Total operating lease right-of-use assets, net	$	429	$	1,054

		*December 31,*		*December 31,*
		*2020*		*2019*
Office leases	$	432	$	698
Land leases		—		—
Total current lease liabilities		432		698
Non-current office leases		—		3
Non-current land leases		—		—
Total lease liabilities	$	432	$	701

Lease, Cost [Table Text Block]

		*December 31,*		*December 31,*
		*2020*		*2019*
Office leases	$	829	$	719
Land leases		446		456
Total operating lease expense		1,275		1,175
Short-term lease expense		319		321
Land option expense		9		543
Total land option and lease expense	$	1,603	$	2,039

		*December 31,*		*December 31,*
		*2020*		*2019*
Cash paid for amounts included in the measurement of operating lease liabilities:
Cash flows from operating activities	$	1,004	$	1,844
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		605		443

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

2021	$	452
2022		—
2023		—
2024		—
2025		—
Thereafter		—
Total undiscounted lease payments		452
Discount to present value		(20	)
Present value of lease liabilities	$	432

Note 8 - Other Non-current Assets (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of Other Assets, Noncurrent [Table Text Block]

Other non-current assets consisted of the following (in thousands):	*December 31,*		*December 31,*
	*2020*		*2019*
Permitting costs⁽¹⁾	$	7,385	$	2,637
Enterprise resource planning system, net		1,805		3,165
Rio Grande Site Lease initial direct costs		7,109		946
Total other non-current assets, net	$	16,299	$	6,748

Note 9 - Accrued Liabilities and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of Accrued Expenses and Other Current Liabilities [Table Text Block]

	*December 31,*		*December 31,*
	*2020*		*2019*
Employee compensation expense	$	14	$	4,221
Terminal and Pipeline asset costs		650		2,503
Accrued legal services		5		1,060
Other accrued liabilities		363		967
Total accrued liabilities and other current liabilities	$	1,032	$	8,751

Note 10 - Preferred Stock and Common Stock Warrants (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	*December 31,*			*December 31,*
	*2020*			*2019*
Stock price	$	2.09		$	6.14
Exercise price	$	0.01		$	0.01
Risk-free rate		0.1	%		1.6	%
Volatility		58.6	%		27.6	%
Term (years)		0.8			1.8

Schedule of Allocation of Net Cash Proceeds [Table Text Block]

			*Year Ended December 31, 2019*
					*Series B*
			*Series B*		*Convertible*
			*Warrants*		*Preferred*
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

Note 11 - Net Loss Per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	*Year Ended*
	*December 31,*
	*2020*			*2019*
Weighted average common shares outstanding:
Basic		117,524			109,057
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants		—			—
Diluted		117,524			109,057

Basic and diluted net loss per share attributable to common stockholders	$	(0.24	)	$	(0.45	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	*Year Ended*
	*December 31,*
	*2020*		*2019*
Unvested stock ⁽¹⁾		916		861
Convertible preferred stock		16,635		13,697
Common Stock Warrants		1,976		1,662
IPO Warrants⁽²⁾		12,082		12,082
Total potentially dilutive common shares		31,609		28,302

Note 12 - Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

	*Year Ended*
	*December 31,*
	*2020*			*2019*
Share-based compensation:
Equity awards	$	(155	)	$	(8,525	)
Liability awards		—			—
Total share-based compensation		(155	)		(8,525	)
Capitalized share-based compensation		(186	)		(1,121	)
Total share-based compensation expense	$	(341	)	$	(9,646	)

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

	*Shares*			*Weighted Average Grant Date Fair Value Per Share*
Non-vested at January 1, 2020		4,772		$	7.95
Granted		225			3.02
Vested		(612	)		5.38
Forfeited		(874	)		8.08
Non-vested at December 31, 2020		3,511		$	8.05

Note 13 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	*Year Ended*
	*December 31,*
	*2020*			*2019*
U.S. federal statutory rate, beginning of year		21	%		21	%
Officers' compensation		2			7
Other		(3	)		(2	)
Valuation allowance		(20	)		(26	)
Effective tax rate as reported		—	%		—	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	*Year Ended*
	*December 31,*
	*2020*			*2019*
Deferred tax assets
Net operating loss carryforwards and credits	$	20,698		$	15,064
Share-based compensation expense		3,813			3,441
Property, plant and equipment		725			1,025
Common stock warrant liabilities		—			524
Operating lease liabilities		91			147
Other		54			21
Less: valuation allowance		(22,669	)		(19,802	)
Total deferred tax assets		2,712			420

Deferred tax liabilities
Common stock warrant liabilities		(1,129	)		—
Operating lease Right-of-use assets		(1,583	)		(420	)
Total deferred tax liabilities		(2,712	)		(420	)

Net deferred tax assets (liabilities)	$	—		$	—

Note 3 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prepaid subscriptions	$ 29	$ 161
Prepaid insurance	314	292
Prepaid marketing and sponsorships	60	25
Other	267	381
Total prepaid expenses and other current assets	$ 670	$ 859

Note 4 - Investment Securities (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Realized Investment Gains (Losses), Total	$ (400)	$ (412)	$ 0

Note 4 - Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
JPMorgan Managed Income Fund, fair value	$ 0	$ 62,207
JPMorgan Managed Income Fund, cost	$ 0	$ 6,278

Note 5 - Sale of Equity Interests in Rio Bravo Pipeline Company, LLC (Details Textual) - Rio Bravo [Member] - USD ($) $ in Millions	Mar. 02, 2020	Feb. 13, 2020	Dec. 31, 2020
Equity Method Investment, Ownership Percentage		100.00%
Disposal Group, Including Discontinued Operation, Consideration	$ 19.4
Proceeds from Divestiture of Businesses	$ 15.0
Equity Method Investments, Rights to The Natural Gas Firm Transportation Capacity Term (Year)		20 years
Sale of Business, Failure to Issue Notice, Maximum Right Price to Sell Back Equity Interests			$ 23.0

Note 6 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Depreciation, Total	$ 196	$ 251

Note 6 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, plant and equipment, net	$ 161,662	$ 134,591
Computer Equipment [Member]
Property, plant and equipment, gross	487	487
Furniture and Fixtures [Member]
Property, plant and equipment, gross	464	471
Leasehold Improvements [Member]
Property, plant and equipment, gross	101	547
Excluding Construction in Progress [Member]
Property, plant and equipment, gross	1,052	1,505
Less: accumulated depreciation	(660)	(793)
Property, plant and equipment, net	392	712
Construction in Progress [Member]
Property, plant and equipment, gross	161,270	133,879
Construction in Progress [Member] \| Rio Grande [Member]
Property, plant and equipment, gross	140,253	121,081
Construction in Progress [Member] \| Rio Bravo [Member]
Property, plant and equipment, gross	$ 21,017	$ 12,798

Note 7 - Leases (Details Textual) $ in Thousands	Mar. 06, 2019 USD ($) a	Dec. 31, 2020 USD ($) a	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Jan. 31, 2017 a
Operating Lease, Liability, Total		$ 432	$ 701
Operating Lease, Right-of-Use Asset		429	1,054
Retained Earnings (Accumulated Deficit), Ending Balance		$ (148,030)	$ (133,701)
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total				$ 1,900
Operating Lease, Right-of-Use Asset				1,600
Deferred Rent Credit				(100)
Accounting Standards Update 2016-02 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings (Accumulated Deficit), Ending Balance				$ (200)
BND [Member]
Area Available for Lease (Acre) \| a	984
Lessee, Operating Lease, Term of Contract (Year)	30 years
Lessee, Operating Lease, Number of Consecutive Renewal Term	2
Lessee, Operating Lease, Renewal Term (Year)	10 years
Operating Lease, Liability, Total	$ 2,300
City of Texas City and the State of Texas [Member]
Area Available for Lease (Acre) \| a					994
Lessee, Operating Lease, Term of Contract (Year)					36 months
Lessee, Operating Lease, Renewal Term (Year)					12 months
Houston, Texas [Member]
Area of Real Estate Property (Acre) \| a		25,600

Note 7 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating lease right-of-use assets, net	$ 429	$ 1,054
Current lease liabilities	432	698
Non-current leases	0	3
Lease liabilities	432	701
Office Leases [Member]
Operating lease right-of-use assets, net	429	610
Current lease liabilities	432	698
Non-current leases	0	3
Land Leases [Member]
Operating lease right-of-use assets, net	0	444
Current lease liabilities	0	0
Non-current leases	$ 0	$ 0

Note 7 - Leases - Lease Expense (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

Operating lease expense

^[1]

$ 1,275

$ 1,175

Short-term lease expense

319

321

Land option expense

543

Total land option and lease expense

1,603

2,039

Cash flows from operating activities

1,004

1,844

Adoption of Topic 842

1,562

In exchange for new operating lease liabilities during the period

605

443

Office Leases [Member]

Operating lease expense

829

719

Land Leases [Member]

Operating lease expense

$ 446

$ 456

[1]	Includes amortization of right-of-use assets for the three months ended March 31, 2020 and 2019 of $294 thousand and $184 thousand, respectively.

Note 7 - Leases - Maturity of Operating Lease (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
2021	$ 452
2022	0
2023	0
2024	0
2025	0
Thereafter	0
Total undiscounted lease payments	452
Discount to present value	(20)
Present value of lease liabilities	$ 432	$ 701

Note 8 - Other Non-current Assets - Schedule of Other Non-current Assets (Details) - USD ($)
$ in Thousands

Dec. 31, 2020

Dec. 31, 2019

Permitting costs(1)

^[1]

$ 7,385

$ 2,637

Enterprise resource planning system, net

1,805

3,165

Rio Grande Site Lease initial direct costs

7,109

946

Total other non-current assets, net

$ 16,299

$ 6,748

[1]

Note 9 - Accrued Liabilities and Other Current Liabilities - Summary of Accrued Liabilities and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Employee compensation expense	$ 14	$ 4,221
Terminal and Pipeline asset costs	650	2,503
Accrued legal services	5	1,060
Other accrued liabilities	363	967
Total accrued liabilities and other current liabilities	$ 1,032	$ 8,751

Note 10 - Preferred Stock and Common Stock Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended			12 Months Ended
	Jan. 15, 2021	May 31, 2019	Sep. 30, 2018	Aug. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Gain (Loss) on Revaluation of Warrants					$ 7,870	$ (2,657)
Series A Warrants [Member]
Exercise of Warrants, Percent of Fully Diluted Common Stock Acquirable					0.71%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 0.01
Series B Warrants [Member]
Exercise of Warrants, Percent of Fully Diluted Common Stock Acquirable					0.71%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 0.01
Common Stock Warrants [Member]
Warrants and Rights Outstanding, Term (Year)					3 years
Exercise of Warrants, Threshold Trading Days (Day)					60 days
Exercise of Warrants, Threshold Consecutive Trading Days (Day)					90 days
Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)						10,094,000
Common Stock [Member] \| Backstop Agreements [Member]
Stock Issued During Period, Shares, New Issues (in shares)				413,658
Series A Convertible Preferred Stock [Member]
Temporary Equity, Stock Issued During Period, Shares, New Issues (in shares)				50,000
Temporary Equity, Par or Stated Value Per Share (in dollars per share)				$ 0.0001
Temporary Equity, Issued Price Per Share (in dollars per share)				$ 1,000
Temporary Equity, Stock Issued During Period, Value, New Issues				$ 50,000
Temporary Equity, Stock Issued During Period, Shares Issued for Services (in shares)				1,000
Preferred Stock, Convertible, Conversion Price (in dollars per share)					$ 7.50
Accretion of Discount Amount					$ 2,500
Series A Convertible Preferred Stock [Member] \| Fund Purchasers [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share)					$ 5.58
Series A Convertible Preferred Stock [Member] \| HGC [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share)					6.24
Series B Convertible Preferred Stock [Member]
Temporary Equity, Stock Issued During Period, Shares, New Issues (in shares)		20,945	29,055
Temporary Equity, Par or Stated Value Per Share (in dollars per share)			$ 0.0001
Temporary Equity, Issued Price Per Share (in dollars per share)		$ 1,000	$ 1,000
Temporary Equity, Stock Issued During Period, Value, New Issues		$ 20,945	$ 29,055
Temporary Equity, Stock Issued During Period, Shares Issued for Services (in shares)		418	581
Convertible Preferred Stock [Member]
Temporary Equity, Issued Price Per Share (in dollars per share)					1,000
Preferred Stock, Convertible, Conversion Price (in dollars per share)					$ 7.34
Temporary Stock, Threshold Trading Days for Conversion (Day)					60 days
Temporary Stock, Threshold Consecutive Trading Days for Conversion (Day)					90 days
Temporary Stock, Conversion Price Minimum Percentage					175.00%
Temporary Stock, Maximum Business Days Following FID Event for Conversion (Day)					10 days
Temporary Equity, Dividend Rate Percentage					12.00%
Dividends, Preferred Stock, Paid-in-kind					$ 14,300	$ 11,200
Convertible Preferred Stock [Member] \| Subsequent Event [Member]
Dividends, Preferred Stock, Paid-in-kind	$ 3,900

Note 10 - Preferred Stock and Common Stock Warrants - Fair Value Assumptions (Details)	Dec. 31, 2020	Dec. 31, 2019
Measurement Input, Share Price [Member]
Warrant measurement input	2.09	6.14
Measurement Input, Exercise Price [Member]
Warrant measurement input	0.01	0.01
Measurement Input, Risk Free Interest Rate [Member]
Warrant measurement input	0.001	0.016
Measurement Input, Price Volatility [Member]
Warrant measurement input	0.586	0.276
Measurement Input, Expected Term [Member]
Warrant measurement input	0.8	1.8

Note 10 - Preferred Stock and Common Stock Warrants - Allocation of Net Cash Proceeds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Proceeds from equity issuance	$ 0	$ 70,945
Series B Warrants [Member]
Net proceeds - Initial Fair Value Allocation		1,936
Per balance sheet upon issuance		1,936
Convertible Preferred Stock [Member]
Proceeds from equity issuance		20,945
Equity issuance costs		0
Net proceeds - Initial Fair Value Allocation		20,945
Series B Convertible Preferred Stock [Member]
Net proceeds - Initial Fair Value Allocation		19,009
Per balance sheet upon issuance		$ 19,009

Note 11 - Net Loss Per Share Attributable to Common Stockholders (Details Textual) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2015
Securities Excluded from Computation of Earnings Per Share Amount, Performance Conditions (in shares)	2.1	3.6
Sale of Stock, Price Per Share (in dollars per share)			$ 17.50
Number of Trading Days of Share Price (Day)			20 days
Total Number of Trading Days Considered (Day)			30 days
IPO Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 11.50
Class of Warrant or Right, Redemption Price of Warrant or Right (in dollars per share)			$ 0.01
Class of Warrant or Right, Number of Days Notice to Redeem (Day)			30 days

Note 11 - Net Loss Per Share Attributable to Common Stockholders - Basic and Diluted Common Shares (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Basic (in shares)	117,524	109,057
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants (in shares)	0	0
Diluted (in shares)	117,524	109,057
Net loss per common share - basic and diluted (in dollars per share)	$ (0.24)	$ (0.45)

Note 11 - Net Loss Per Share Attributable to Common Stockholders - Anti-dilutive Securities (Details) - shares
shares in Thousands

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

31,609

28,302

Unvested Stock [Member]

Convertible Preferred Stocks [Member]

^[1]

916

861

Common Stock Warrants [Member]

16,635

13,697

1,976

1,662

IPO Warrants [Member]