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Long-term Debt - Carrying Amount of the 1.50% Notes (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Less: Unamortized issuance costs $ 2,900 $ 600
Net carrying amount of the liability component 160,434 165,759
1.5% Convertible Unsecured Senior Notes    
Debt Instrument [Line Items]    
Principal amount of the liability component 25,969 157,369
Less: Unamortized discount 0 12,308
Less: Unamortized issuance costs 204 1,819
Net carrying amount of the liability component $ 25,765 143,242
Net carrying amount of the equity component   $ 25,683