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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

Reconciliation between the tax provision computed at the federal statutory income tax rate and the Company's actual effective income tax rate are as follows:

			Year Ended December 31,
			2021						2020
Federal statutory tax rate			21		%				21		%
R&D tax credit			2						1
Stock-based compensation and other permanent differences			—						—
Change in valuation allowance			(23)						(22)
Total			—		%				—		%

Schedule of Deferred Tax Assets and Liabilities

Significant components of net deferred tax assets are as follows (in thousands):

			December 31,
			2021						2020
Deferred tax assets:
Net operating losses			$	52,832					$	42,331
Property and equipment			555						303
R&D tax credit			5,209						3,830
Stock-based compensation			717						490
Capitalized R&D expenses			6,268						3,109
Inventory			909						511
Lease liability			1,003						1,461
Accruals and reserves			1,418						1,144
Total deferred tax assets			68,911						53,179
Valuation allowance			(68,046)						(52,005)
Net deferred tax assets			865						1,174
Deferred tax liabilities:
Right-of-use assets			(865)						(1,174)
Total deferred tax liabilities			(865)						(1,174)
Net deferred tax assets			$	—					$	—

Schedule of Unrecognized Tax Benefits Roll Forward

A reconciliation of the change in the unrecognized tax benefit during the year is as follows (in thousands):

			December 31,
			2021						2020
Beginning of year			$	1,407					$	986
Additions for tax positions related to:
Current year			510						421
Prior years			—						—
End of year			$	1,917					$	1,407

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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.

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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.

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Tabular disclosure of the change in unrecognized tax benefits.

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