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Income Taxes (Deferred Tax Assets (Liabilities)) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Taxes [Abstract] |  |
Reserves on inventory and sales | $ 753 | $ 745
Credit and loss carryforwards | 2,546 | 1,269
Stock compensation | 1,015 | 756
Accrued expenses and deferred costs | 3,274 | 2,465
Inventory capitalization | 120 | 307
Lease obligations | 2,178 | 3,288
Valuation allowance | (1,436) |
Total deferred tax assets | 8,450 | 8,830
Right-of-use assets | (2,032) | (3,114)
Unrealized loss on investments | (24) | (10)
Prepaid expenses | (1,022) | (1,034)
Depreciation | (4,680) | (3,365)
Total deferred tax liabilities | (7,758) | (7,523)
Net deferred tax asset | $ 692 | $ 1,307

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