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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)

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