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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 79 | $ 123
Residential product warranty reserve | 7,804 | 8,876
Stock-based compensation | 1,725 | 1,823
Accruals not currently deductible and other | 3,928 | 1,838
Inventories | 4,682 | 3,783
State tax credit carryforwards | 3,400 | 3,619
Gross deferred tax assets, before valuation allowance | 21,618 | 20,062
Valuation allowance | (3,015) | (3,096)
Gross deferred tax assets, after valuation allowance | 18,603 | 16,966
Deferred tax liabilities: |  |
Depreciation | (13,893) | (12,046)
Goodwill amortization | (3,774) | (2,781)
Inventories and other | (3,061) | (3,228)
Gross deferred tax liabilities | (20,728) | (18,055)
Net deferred tax liability | $ (2,125) | $ (1,089)

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