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Unsecured Convertible Senior Notes - Interest expense recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
2023 Unsecured Convertible Senior Notes
Interest Expense, Debt [Abstract]
Contractual interest expense	$ 5,938	$ 5,938	$ 10,410
Amortization of debt issuance costs	663	618	669
Amortization of debt discount			7,728
Total	6,601	6,556	18,807
2026 Unsecured Convertible Senior Notes
Interest Expense, Debt [Abstract]
Contractual interest expense	11,814	11,814	4,397
Amortization of debt issuance costs	1,167	1,078	230
Amortization of debt discount			3,022
Total	$ 12,981	$ 12,892	$ 7,649

X

- Definition

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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