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Convertible Senior Notes - Interest expenses incurred on Convertible notes payable (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Convertible Senior Notes        
Coupon interest $ 881 $ 885 $ 2,616 $ 2,600
Amortization of debt issuance costs 635 194 1,903 579
Total interest expense on notes payable $ 1,516 $ 1,079 $ 4,519 $ 3,179