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Debt - Impact to Shareholders' Equity (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 01, 2020
Aug. 31, 2018
Sep. 30, 2020
Sep. 30, 2020
Debt Instrument [Line Items]        
Total     $ (3) $ 46,832
2023 Notes        
Debt Instrument [Line Items]        
Conversion option   $ 53,820    
Purchase of capped calls   (26,910)    
Issuance costs   (1,626)    
Total   $ 25,284    
2025 Notes        
Debt Instrument [Line Items]        
Conversion option $ 48,346      
Purchase of capped calls (27,255)      
Issuance costs (1,514)      
Total $ 19,577