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Unsecured Convertible Senior Notes - Interest expense recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
2023 Unsecured Convertible Senior Notes
Interest Expense, Debt [Abstract]
Contractual interest expense	$ 1,484	$ 1,484	$ 2,969	$ 2,969
Amortization of debt issuance costs	164	153	325	303
Total	1,648	1,637	3,294	3,272
2026 Unsecured Convertible Senior Notes
Interest Expense, Debt [Abstract]
Contractual interest expense	2,954	2,954	5,907	5,907
Amortization of debt issuance costs	290	273	575	519
Total	$ 3,244	$ 3,227	$ 6,482	$ 6,426

X

- Definition

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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