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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Inventory $ 834 $ 1,766
Warranty 67 113
Net operating loss and tax credit carryforwards 37,045 53,721
Accrued expenses 4 7
Stock based compensation 352 387
Investment in affiliates 48  
Deferred tax assets gross 38,350 55,994
Less-valuation allowance (38,328) (55,739)
Net deferred tax assets 22 255
Deferred tax liabilities:    
Depreciation and amortization (21) (46)
Investment in affiliates   (209)
Goodwill amortization (15)  
Net deferred tax liabilities (36) $ (255)
Net deferred tax assets (liabilities) $ (14)