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Income Taxes (Deferred Tax Assets (Liabilities)) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Income Taxes [Abstract] |  |  |
Reserves on inventory and sales | $ 446 | $ 199 | $ 291
Credit and loss carryforwards | 527 | 735 | 699
Stock compensation | 1,333 | 1,149 | 1,283
Accrued expenses and deferred costs | 638 | 1,068 | 3,170
Inventory capitalization | 252 | 49 | 142
Sales tax accrual |  |  | 8
Unrealized gain/loss on investments | 160 | 85 |
Total deferred tax assets | 3,356 | 3,285 | 5,593
Unrealized loss on investments |  |  | (294)
Prepaid expenses | (659) | (755) | (779)
Depreciation | (3,453) | (6,189) | (6,285)
Foreign currency | (23) | (23) |
Total deferred tax liabilities | (4,135) | (6,967) | (7,358)
Net deferred tax liabilities | $ (779) | $ (3,682) | $ (1,765)

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