Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Debt Instrument [Line Items]
Total interest expense	$ 3,861	$ 1,338
Senior Notes
Debt Instrument [Line Items]
Contractual interest expense	822	139
Amortization of debt discount	0	0
Amortization of debt issuance costs	1,288	789
Total interest expense	2,110	928
1.75% Convertible Senior Notes due 2023 | Senior Notes
Debt Instrument [Line Items]
Contractual interest expense	103	104
Amortization of debt discount	0	0
Amortization of debt issuance costs	38	72
Total interest expense	141	176
0% Convertible Senior Notes due 2025 | Senior Notes
Debt Instrument [Line Items]
Contractual interest expense	0	0
Amortization of debt discount	0	0
Amortization of debt issuance costs	690	690
Total interest expense	690	690
0.5% Convertible Senior Notes Due 2027 | Senior Notes
Debt Instrument [Line Items]
Contractual interest expense	719	35
Amortization of debt discount	0	0
Amortization of debt issuance costs	560	27
Total interest expense	$ 1,279	$ 62