Long-term Debt - Schedule of Interest (Details) - Convertible Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Contractual interest expense	$ 1,509	$ 1,493	$ 4,528	$ 3,388
Amortization of debt discount and issuance costs	361	2,655	1,069	5,910
Total interest expense	$ 1,870	4,148	$ 5,597	9,298
Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Amortization of debt discount and issuance costs		(2,335)		(5,167)
Total interest expense		(2,335)		(5,167)
Cumulative Effect, Period of Adoption, Adjusted Balance
Debt Instrument [Line Items]
Contractual interest expense		1,493		3,388
Amortization of debt discount and issuance costs		320		743
Total interest expense		$ 1,813		$ 4,131