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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
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