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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Research and development tax credit carryforwards $ 36,041,000 $ 29,046,000
Net operating loss carryforwards 5,985,000 5,923,000
Stock-based compensation 2,341,000 1,796,000
Inventory reserves 2,268,000 2,282,000
Investment tax credit carryforwards 1,928,000 1,927,000
UNICAP 1,363,000 1,336,000
Vacation accrual 1,338,000 1,349,000
Lease liabilities 787,000 518,000
Accrued payroll tax deferral 384,000 764,000
Other 1,568,000 1,197,000
Total deferred tax assets 54,003,000 46,138,000
Less: Valuation allowance for deferred tax assets (43,329,000) (37,856,000)
Net deferred tax assets 10,674,000 8,282,000
Deferred tax liabilities:    
Depreciation (9,048,000) (6,809,000)
Prepaid expenses (662,000) (616,000)
ROU assets (756,000) (490,000)
Other 0 (141,000)
Total deferred tax liabilities (10,466,000) (8,056,000)
Net deferred tax assets (liabilities) $ 208,000 $ 226,000