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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Net operating losses and credits | $ 63,052 | $ 75,630
Depreciation | 7,495 | 5,952
Amortization | 3,633 |
Stock-based compensation | 9,984 | 9,815
Deferred compensation | 27,939 | 21,434
Revaluation of equity investments and licenses | 3,148 | 3,465
Inventory | 4,588 | 4,864
Accrued liabilities and reserves | 7,213 | 8,230
Other | 8,727 | 11,873
Total deferred tax assets | 135,779 | 141,263
Valuation allowance | (53,893) | (62,098)
Deferred tax assets, net of valuation allowance | 81,886 | 79,165
Capitalized software | (19,491) | (19,630)
Amortization |  | (3,394)
Indefinite-lived intangibles | (13,753) | (13,254)
Deferred tax liability on foreign earnings | (20,443) | (21,000)
Total deferred tax liabilities | (53,687) | (57,278)
Net deferred tax assets | $ 28,199 | $ 21,887

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