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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Valuation Allowance [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 113,729 $ 21,527 $ 0  
Income before taxes        
Domestic (63,829) 46,031 38,211  
Foreign (6,799) (5,042) (15,574)  
Income (loss) before income taxes (70,628) 40,989 22,637  
Federal:        
Current 5,451 20,661 22,115  
Deferred 82,726 43,678 (2,198)  
State:        
Current 333 495 884  
Deferred 522 (43) (271)  
Foreign:        
Current 1,592 1,101 1,275  
Deferred (3,295) (2,041) (5,988)  
Provision for (benefit from) income taxes $ 87,329 $ 63,851 $ 15,817  
Effective income tax rate reconciliation        
Expense (benefit) at U.S. federal statutory rate (as a percent) 21.00% 35.00% 35.00%  
Expense (benefit) at state statutory rate (as a percent) (1.20%) 0.70% 1.80%  
Withholding tax (as a percent) (7.70%) 50.10% 97.00%  
Foreign rate differential (as a percent) (0.20%) 2.80% 4.10%  
Research and development ("R&D") credit (as a percent) 2.20% (3.90%) (8.30%)  
Executive compensation (as a percent) (0.10%) 1.80% 1.50%  
Non-deductible stock-based compensation (as a percent) (2.80%) 14.90% 34.80%  
Foreign tax credit (as a percent) 7.70% (50.10%) (97.00%)  
Foreigh derived intangible income deduction (as a percent) 14.80% 0.00% 0.00%  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 0.00% 50.60% 0.00%  
Other (as a percent) 0.70% 1.40% 1.00%  
Valuation allowance (as a percent) (158.00%) 52.50% 0.00%  
Effective tax rate (as a percent) (123.60%) 155.80% 69.90%  
Components of net deferred tax assets        
Depreciation and amortization $ 13,085 $ 10,840    
Other liabilities and reserves 8,272 8,766    
Deferred equity compensation 6,236 7,979    
Net operating loss carryovers 21,259 16,335    
Tax credits 253,890 157,051    
Total gross deferred tax assets 302,742 200,971   $ 105,000
Convertible debt (207) (791)    
Deferred Tax Assets, Deferred Income (143,182) 0    
Deferred Tax Liabilities, Gross (143,389) (791)    
Total net deferred tax assets 159,353 200,180    
Valuation allowance (173,878) (50,911)   (16,000)
Net deferred tax assets   149,269    
Net deferred tax assets reported as:        
Non-current deferred tax assets 4,435 159,099    
Non-current deferred tax liabilities (18,960) (9,830)    
Net deferred tax assets   $ 149,269    
Net deferred tax liabilities $ (14,525)     $ (174,000)