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Income Taxes (Deferred Tax Assets (Liabilities)) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Reserves on inventory and sales $ 233 $ 446
Credit and loss carryforwards 494 527
Stock compensation 952 1,333
Accrued expenses and deferred costs 642 638
Inventory capitalization 229 252
Unrealized gain/loss on investments 74 160
Total deferred tax assets 2,624 3,356
Prepaid expenses (667) (659)
Depreciation (2,165) (3,453)
Foreign currency   (23)
Total deferred tax liabilities (2,832) (4,135)
Net deferred tax liabilities $ (208) $ (779)