Long-term Debt - Schedule of Interest (Details) - Convertible Notes - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Contractual interest expense	$ 1,510	$ 1,509	$ 3,019	$ 1,895
Amortization of debt discount and issuance costs	354	2,604	709	3,254
Total interest expense	$ 1,864	4,113	$ 3,728	5,149
Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Amortization of debt discount and issuance costs		(2,263)		(2,832)
Total interest expense		(2,263)		(2,832)
Cumulative Effect, Period of Adoption, Adjusted Balance
Debt Instrument [Line Items]
Contractual interest expense		1,509		1,895
Amortization of debt discount and issuance costs		341		422
Total interest expense		$ 1,850		$ 2,317