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Convertible Senior Notes - Interest Expense Recognized (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 0	$ 0	$ 0	$ 0
Amortization of debt discount	0	4,491	0	4,491
Amortization of issuance costs	663	225	1,970	225
Total interest expense	663	4,716	1,970	4,716
2025 Notes
Debt Instrument [Line Items]
Contractual interest expense	221	252	676	750
Amortization of debt discount	0	8,938	0	26,621
Amortization of issuance costs	749	614	2,297	1,829
Total interest expense	$ 970	9,804	2,973	29,200
2023 Notes
Debt Instrument [Line Items]
Contractual interest expense		169	78	599
Amortization of debt discount		2,458	0	8,709
Amortization of issuance costs		292	242	1,035
Total interest expense		$ 2,919	$ 320	$ 10,343

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