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Convertible Senior Notes - Interest Expense Recognized (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 0	$ 0
Amortization of issuance costs	650	650
Total interest expense	650	650
2025 Notes
Debt Instrument [Line Items]
Contractual interest expense	215	237
Amortization of issuance costs	732	808
Total interest expense	947	1,045
2023 Notes
Debt Instrument [Line Items]
Contractual interest expense	0	66
Amortization of issuance costs	0	168
Total interest expense	$ 0	$ 234

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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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