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Income Taxes (Deferred Tax Assets (Liabilities)) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Taxes [Abstract] |  |
Reserves on inventory and sales | $ 745 | $ 647
Credit and loss carryforwards | 1,269 | 681
Stock compensation | 756 | 812
Accrued expenses and deferred costs | 2,639 | 2,473
Inventory capitalization | 307 | 275
Unrealized loss on investments | (10) |
Unrealized gain on investments |  | 65
Total deferred tax assets | 5,716 | 4,953
Prepaid expenses | (1,034) | (774)
Depreciation | (3,365) | (1,199)
Total deferred tax liabilities | (4,409) | (1,973)
Net deferred tax asset | $ 1,307 | $ 2,980

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