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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 88 | $ 79
Residential product warranty reserve | 6,486 | 7,804
Stock-based compensation | 1,055 | 1,725
Accruals not currently deductible and other | 2,245 | 3,928
Inventories | 5,780 | 4,682
Operating lease liability | 10,618 |
State tax credit carryforwards | 3,461 | 3,400
Gross deferred tax assets, before valuation allowance | 29,733 | 21,618
Valuation allowance | (2,988) | (3,015)
Gross deferred tax assets, after valuation allowance | 26,745 | 18,603
Deferred tax liabilities: |  |
Depreciation | (17,267) | (13,893)
Operating lease right-of-use asset | (10,162) |
Goodwill amortization | (4,782) | (3,774)
Inventories and other | (4,365) | (3,061)
Gross deferred tax liabilities | (36,576) | (20,728)
Net deferred tax liability | $ (9,831) | $ (2,125)

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