Debt - Balances of Long-term Debt, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Liability component - principal	$ 200,000	$ 200,000
Exit fee		14,000
Unamortized debt discount associated with the exit fee, debt financing costs and discount with warrant financing	(7,931)	(19,750)
Liability component - net carrying value	192,069	194,250
Less current portion	(2,000)
Long term debt, net	$ 190,069	$ 194,250