Debt - Schedule of Interest Expense (Details) - 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]
Amortization of issuance costs			$ 573	$ 700	[1]
Convertible Debt | Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Contractual interest expense	$ 18	$ 0	18	0
Amortization of issuance costs	$ 95	$ 0	$ 95	$ 0

[1] Certain prior period amounts have been revised to correct immaterial errors. See Note 1 for more information.