Notes Payable - Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest Expense
Contractual interest expense	$ 1,125	$ 1,804	$ 4,619	$ 5,412
Amortization of debt issuance costs	399	426	1,453	1,237
Amortization of debt discount		5,611		16,550
Total interest expense	$ 1,524	$ 7,841	$ 6,072	$ 23,199

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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