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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Deferred tax assets: |  |  |
Allowances and operating liabilities | $ 8 | $ 8 | $ 8
Net operating loss carryforwards | 56 | 52 | 78
Foreign tax credit carryforwards | 8 | 29 | 5
Trade credit | 1 | 1 | 3
Allowance for doubtful accounts | 6 | 6 | 10
Inventory reserve | 10 | 12 | 18
Stock-based compensation | 8 | 15 | 19
Intangible assets | 24 | 27 | 53
Other | 4 | 2 | 6
Total deferred tax assets | 125 | 152 | 200
Deferred tax liabilities: |  |  |
Tax over book depreciation |  |  | (4)
Total deferred tax liabilities |  |  | (4)
Net deferred tax assets before valuation allowance | 125 | 152 | 196
Valuation allowance | (129) | (157) | (202)
Net deferred tax liabilities | $ (4) | $ (5) | $ (6)

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