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Convertible Senior Notes Due 2023 (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Summary of liability component of 2023 Notes The liability component of the 2023 Notes consists of the following (dollars in thousands):
June 30,
2022		December 31,
2021
(unaudited) 
2023 Notes$402,500 $402,500 
Unamortized debt discount and deferred financing costs(1,591)(23,248)
Total carrying value$400,909 $379,252