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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)