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Income Taxes - Deferred tax liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net operating losses and credits $ 61,962 $ 55,939      
Depreciation 5,701 4,776      
Operating lease 24,317 19,849      
Amortization 2,377 3,738      
Stock-based compensation 7,773 9,790      
Deferred compensation 27,754 20,077      
Unrealized foreign currency gain/loss   7,955      
Deferred revenue 11,341 9,696      
Revaluation of equity investments and licenses 4,492 3,424      
Inventory 5,060 4,824      
Accrued liabilities and reserves 10,639 7,215      
Other 3,483 3,839      
Total deferred tax assets 164,899 151,122      
Valuation allowance (60,101) (51,221) $ (51,221) $ (53,893) $ (62,098)
Deferred tax assets, net of valuation allowance 104,798 99,901      
Capitalized software (23,748) (21,025)      
Operating lease (24,314) (19,553)      
Indefinite-lived intangibles (14,973) (14,363)      
Deferred tax liability on foreign earnings (17,277) (18,027)      
Unrealized foreign currency gain/loss (10,819)        
Total deferred tax liabilities (91,131) (72,968)      
Net deferred tax assets $ 13,667 $ 26,933