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Convertible Senior Notes - Interest expenses incurred on Convertible notes payable (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Convertible Senior Notes |  |
Coupon interest | $ 1,005 | $ 2,108
Amortization of debt issuance costs | 3,419 | 437
Total interest expense on Convertible Senior Notes | $ 4,424 | $ 2,545

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