Leases - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jan. 21, 2021	Dec. 31, 2020	Sep. 30, 2020
Leases [Abstract]
Operating lease, borrowing rate		15.93%
Operating lease, discount rate	7.25%
Operating lease, weighted average remaining lease term	1 year 4 months 24 days
Finance lease, weighted average remaining lease term	7 months 6 days
Restricted cash held in other assets	$ 0		$ 300	$ 342