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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 123 | $ 93
Residential product warranty reserve | 8,876 | 14,510
Stock-based compensation | 1,823 | 2,186
Accruals not currently deductible and other | 1,838 | 2,261
Inventories | 3,783 | 5,785
State tax credit carryforwards | 3,619 | 4,020
Gross deferred tax assets, before valuation allowance | 20,062 | 28,855
Valuation allowance | (3,096) | (4,061)
Gross deferred tax assets, after valuation allowance | 16,966 | 24,794
Deferred tax liabilities: |  |
Depreciation and other | (18,055) | (25,688)
Gross deferred tax liabilities | (18,055) | (25,688)
Net deferred tax (liability) asset | $ (1,089) | $ (894)

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