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Debt - Convertible Senior Notes, Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
d
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
d
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]            
Interest expense, debt     $ 400,000 $ 1,800,000    
Extinguishment of Convertible Senior Notes through issuance of common stock     48,000 86,428,000    
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature $ 26,180,000 $ 590,000        
Change in fair value of derivative liabilities - Convertible Senior Notes 1,100,000   1,084,000 0    
Debt Instrument, Convertible, If-converted Value in Excess of Principal, Liability 27,300,000   27,300,000      
Convertible Debt Securities            
Debt Instrument [Line Items]            
Derivative Liability, Current 27,264,000   $ 27,264,000      
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature $ 26,200,000          
Convertible Senior Notes            
Debt Instrument [Line Items]            
Face amount           $ 172,500,000
Convertible Senior Notes | 3.25% Convertible Senior Notes due 2020            
Debt Instrument [Line Items]            
Debt issuance cost           5,100,000
Deferred financing costs           $ 4,200,000
Debt instrument, term         6 years  
Adjustments to additional paid in capital         $ 900,000  
Effective interest rate           6.90%
Conversion ratio     31.1891      
Conversion price (in usd per share) | $ / shares $ 32.06   $ 32.06      
Number of threshold trading days | d 20          
Number of threshold consecutive trading days | d 30          
Threshold percentage of stock price trigger 130.00%          
Threshold consecutive trading days | d     5      
Threshold percentage of stock price trigger     98.00%      
Amortization of debt discount (premium)     $ 200,000 900,000    
Interest expense     $ 200,000 $ 900,000    
Extinguishment of Convertible Senior Notes through issuance of common stock $ 5,900,000          
Convertible Senior Notes | Convertible Senior Notes | 3.25% Convertible Senior Notes due 2020            
Debt Instrument [Line Items]            
Stated interest rate 3.25%   3.25%