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Convertible Senior Notes - Interest expenses incurred on Convertible notes payable (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Convertible Senior Notes        
Coupon interest $ 872 $ 853 $ 1,734 $ 1,715
Amortization of debt issuance costs 634 193 1,268 385
Total interest expense $ 1,506 $ 1,046 $ 3,002 $ 2,100