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Convertible Senior Notes - Interest Expense Recognized (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 0	$ 0	$ 0	$ 0
Amortization of issuance costs	657	657	1,307	1,307
Total interest expense	657	657	1,307	1,307
2025 Notes
Debt Instrument [Line Items]
Contractual interest expense	219	218	434	455
Amortization of issuance costs	740	740	1,472	1,548
Total interest expense	959	958	1,906	2,003
2023 Notes
Debt Instrument [Line Items]
Contractual interest expense	0	12	0	78
Amortization of issuance costs	0	74	0	242
Total interest expense	$ 0	$ 86	$ 0	$ 320

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