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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)

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