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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 93 | $ 138
Warranty reserve | 14,510 | 12,904
Stock-based compensation | 2,186 | 1,554
Accruals not currently deductible and other | 2,261 | 6,195
Inventories | 5,785 | 4,406
State tax credit carryforwards | 4,020 | 4,350
Gross deferred tax assets, before valuation allowance | 28,855 | 29,547
Valuation allowance | (4,061) | (4,582)
Gross deferred tax assets, after valuation allowance | 24,794 | 24,965
Deferred tax liabilities: |  |
Depreciation and other | (25,688) | (20,426)
Gross deferred tax liabilities | (25,688) | (20,426)
Net deferred tax liability | $ (894) |
Net deferred tax asset |  | $ 4,539

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