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Income Taxes - Reconciliation of U.S. Federal Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory Federal income tax rate	$ (4,875)	$ (3,362)
Tax credits	(215)	(207)
Change in warrant fair market value	1,014
Stock-based compensation	252	141
Goodwill impairment		392
Permanent items	627	4
Section 382 limitation on net operating losses and credits	10,562
Other	89	38
Change in valuation allowance	(7,858)	$ 2,994
Provision (benefit) for income taxes	$ (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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible impairment loss.

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