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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

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