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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Summary of Reconciliation of Statutory IncomeTax Rate

The following table reconciles the United States statutory income tax rate with our effective income tax rate:

		Year ended December 31,
		2020				2019				2018
United States statutory rate			21.0	%			21.0	%			21.0	%
State tax, net of federal benefit			4.2	%			1.0	%			0.7	%
Stock-based compensation			(0.5	%)			(1.6	%)			3.6	%
Officer compensation			(1.0	%)			(1.3	%)			—	%
Deferred rate change			—	%			—	%			0.3	%
R&D credit			0.8	%			1.8	%			0.7	%
Other			(0.1	)%			0.3	%			0.7	%
Change in valuation allowance			(24.4	%)			(21.2	%)			(27.0	%)
Effective income tax rate			—	%			—	%			—	%

Schedule of Deferred Tax Assets And Liabilities

Deferred assets and liabilities consist of the following:

		December 31,
In Thousands		2020				2019				2018
Net operating losses		$	33,392			$	24,852			$	16,372
Stock-based compensation			2,531				3,637				2,747
Financing lease obligations			4,574				4,640				4,009
Tax credit carry forwards			2,577				2,106				922
Compensation			339				97				474
Derivative liability			703				—				—
Other			391				307				116
Gross deferred tax assets			44,507				35,639				24,640
Less valuation allowance			(39,898	)			(30,888	)			(20,329	)
Net deferred tax assets			4,609				4,751				4,311
Fixed assets			(4,609	)			(4,746	)			(4,352	)
Other			—				(5	)			41
Gross deferred tax liabilities			(4,609	)			(4,751	)			(4,311	)
Net deferred tax asset or liability		$	—			$	—			$	—

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- References

No definition available.

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- Definition

Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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