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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 138 | $ 347
Warranty reserve | 12,904 | 13,032
Stock-based compensation | 1,554 | 2,931
Accruals not currently deductible and other | 6,195 | 5,221
Inventories | 4,406 | 4,437
State tax credit carryforwards | 4,350 | 4,050
Gross deferred tax assets, before valuation allowance | 29,547 | 30,018
Valuation allowance | (4,582) | (4,465)
Gross deferred tax assets, after valuation allowance | 24,965 | 25,553
Deferred tax liabilities: |  |
Depreciation and other | (20,426) | (19,990)
Gross deferred tax liabilities | (20,426) | (19,990)
Net deferred tax asset | $ 4,539 | $ 5,563

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