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Income Taxes - Reconciliation of U.S. Federal Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Statutory Federal income tax rate	$ (7,741)	$ (4,875)
State income taxes, net of Federal tax benefits	(445)
Tax credits	(651)	(215)
Change in warrant fair market value		1,014
Stock-based compensation	651	252
Permanent items	2	627
Section 382 limitation on net operating losses and credits		10,562
State rate differential	235
NOL true-up	(991)
Other	146	89
Change in valuation allowance	6,440	(7,858)
Provision (benefit) for income taxes	$ (2,354)	$ (404)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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