Convertible Senior Notes - Interest Expense Recognized (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 0	$ 0	$ 0	$ 0
Amortization of issuance costs	556	663	1,863	1,970
Total interest expense	556	663	1,863	1,970
2025 Notes
Debt Instrument [Line Items]
Contractual interest expense	220	221	654	676
Amortization of issuance costs	749	749	2,221	2,297
Total interest expense	969	970	2,875	2,973
2023 Notes
Debt Instrument [Line Items]
Contractual interest expense	0	0	0	78
Amortization of issuance costs	0	0	0	242
Total interest expense	$ 0	$ 0	$ 0	$ 320