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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Inventory $ 500 $ 834
Warranty 63 67
Net operating loss and tax credit carryforwards 37,937 37,045
Accrued expenses 4 4
Stock based compensation 379 352
Investment in affiliates 0 48
Deferred tax assets gross 38,883 38,350
Less - valuation allowance (38,809) (38,328)
Net deferred tax assets 74 22
Deferred tax liabilities:    
Depreciation and amortization (11) (21)
Investment in affiliates (28) 0
Goodwill amortization (44) (15)
Net deferred tax liabilities (83) (36)
Net deferred tax assets (liabilities) $ (9) $ (14)