Right-of-Use Assets and Lease Obligations - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) lease	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) lease	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Number of leases | lease	3		3
Right of use assets	$ 2,917		$ 2,917		$ 3,448
Operating lease expense	431	$ 377	1,294	$ 819
Variable lease expense	$ 117	$ 60	$ 352	$ 166
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Estimated discount rate						16.90%
Right of use assets						$ 4,048
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year 6 months		1 year 6 months
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	5 years		5 years