Debt - Convertible Debt (Details) - 1.75% senior notes due in 2026 - Senior notes - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Conversion [Line Items]
Contractual interest expense	$ 8,750	$ 5,906
Amortization of debt discount	20,382	12,856
Amortization of issuance costs	1,464	853
Total Convertible Notes interest expense	$ 30,596	$ 19,615

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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