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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating Loss Carryforwards [Line Items]    
Deferred income tax benefit $ 508 $ 4,074
Deferred tax liabilities 6,720  
Domestic Tax Authority    
Operating Loss Carryforwards [Line Items]    
Taxable income (loss) 91,600 (35,100)
Current income tax expense (benefit)   113
Operating loss carryforwards 460,700  
Research and development tax credits 8,300  
Foreign Tax Authority    
Operating Loss Carryforwards [Line Items]    
Current income tax expense (benefit) (70) $ (125)
Operating loss carryforwards 158,876  
Generated After 2017    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards $ 208,200