Income Taxes - Summary of Net Deferred Tax Accounts (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets:
Net operating loss carryforwards	$ 4,138	$ 4,759
Amortization	2,942	3,500
Federal, foreign, and state credits	2,399	2,086
Inventory reserves	995	1,159
Deferred gain	866	870
Deferred rent	498	159
Stock compensation	465	494
Accrued vacation	264	220
Other	401	404
Gross deferred tax assets	12,968	13,651
Valuation allowance	(12,938)	(13,490)
Net deferred tax asset	30	161
Deferred Tax Liabilities:
Depreciation	(30)	(161)
Net Deferred Tax Assets	$ 0	$ 0

Deferred tax assets accrued vacation.

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Deferred Tax Assets Deferred rent.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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