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Convertible Senior Notes - Carrying Value of 2026 Notes (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Feb. 05, 2021
Debt Instrument [Line Items]    
2026 Notes embedded conversion derivative $ 48,208  
Convertible Debt | Convertible Senior Unsecured Notes Due 2026    
Debt Instrument [Line Items]    
Principal amount 155,250  
Less: unamortized discount and issuance costs, net of amortization (34,332)  
Carrying amount 120,918  
Convertible Debt | Convertible Senior Unsecured Notes Due 2026 | Embedded conversion derivative    
Debt Instrument [Line Items]    
Less: unamortized discount and issuance costs, net of amortization (34,300)  
2026 Notes embedded conversion derivative $ 48,208 $ 33,200