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Debt - Convertible Senior Notes, Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2014
USD ($)
Sep. 30, 2020
USD ($)
d
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
d
$ / shares
Sep. 30, 2019
USD ($)
Sep. 30, 2015
Debt Instrument [Line Items]              
Interest expense, debt         $ 600,000 $ 2,100,000  
Extinguishment of Convertible Senior Notes through issuance of common stock         508,000 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   40,400,000     40,400,000    
Payments on convertible notes and derivative liability   43,400,000     $ 43,416,000 0  
Convertible Debt Securities              
Debt Instrument [Line Items]              
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)         $ 300,000 1,100,000  
Interest expense         $ 300,000 $ 1,000,000.0  
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%