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Convertible Senior Notes - Outstanding (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Debt    
Net carrying amount $ 139,286 $ 99,575
Convertible senior notes    
Debt    
Principal 143,750  
Less: unamortized issuance costs (4,464)  
Net carrying amount $ 139,286  
Debt term 6 years  
Effective interest rate 3.26%