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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Inventory $ 201 $ 500
Warranty 5 63
Net operating loss and tax credit carryforwards 37,440 37,812
Accrued expenses 7 4
Stock based compensation 502 379
Investment in affiliates assets 482  
Investment in affiliates liabilities   (28)
Deferred Revenue - Advance payment 64 0
Deferred tax assets gross 38,701 38,730
Less - valuation allowance (38,601) (38,684)
Net deferred tax assets 100 46
Deferred tax liabilities:    
Depreciation and amortization (55) (11)
Goodwill amortization (56) (44)
Net deferred tax liabilities (111) (55)
Net deferred tax assets (liabilities) $ (11) $ (9)