Leases - Summary of Weighted Average Remaining Lease Term and Discount Rate (Details)	Sep. 30, 2021	Dec. 31, 2020
Weigted average remaining lease term (years)
Weighted average remaining lease term - operating leases	3 years 6 months 10 days	4 years 2 months 15 days
Weighted average remaining lease term - finance leases	1 year 11 months 12 days	2 years 5 months 1 day
Weighted average discount rate
Weighted average discount rate - operating leases (as a percent)	10.50%	10.50%
Weighted average discount rate - finance leases (as a percent)	10.50%	10.50%