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Fair Value of Financial Instruments (Details 2) - 1.375% Convertible senior notes due 2023 - Convertible senior notes - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt instrument    
Face value $ 172,500 $ 172,500
Carrying value 161,733 156,031
Fair value $ 221,173 $ 194,709