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Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]    
Tax credit carryforwards subject to expiration $ 2,100,000  
Valuation allowance amount 332,200,000 $ 330,100,000
Tax benefits credited to additional paid-in capital 55,700,000  
Unrecognized tax benefits $ 0  
Possible extension period of tax holiday 3 years  
Federal    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards $ 438,800,000  
Research and development tax credit carryforwards 54,400,000  
Research and development tax credit carryforwards subject to expiration 100,000  
State and Local Jurisdiction    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 324,100,000  
Research and development tax credit carryforwards 52,700,000  
Foreign Tax Authority    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 124,100,000  
Decrease in foreign taxes from tax holiday $ 200,000