Debt - Interest Expense of Convertible Notes (Details) - Convertible Senior Notes - Convertible Senior Notes Due 2024 - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Stated interest	$ 1,186	$ 1,186	$ 2,372	$ 2,372
Amortized debt discount	0	5,694	0	11,176
Amortized issuance costs	452	242	899	474
Interest expense	$ 1,638	$ 7,122	$ 3,271	$ 14,022

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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

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