Leases - Summary of Lease Costs Recognized under ASC 842 and Other Information Pertaining to Operating Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Leases [Abstract]
Operating lease cost	$ 1,126	$ 3,351
Variable lease cost	123	391
Short-term lease cost	15	45
Sublease income	(650)	(2,077)
Total lease cost	$ 614	1,710
Cash paid for amounts included in the measurement of lease liabilities		$ 3,894
Weighted-average remaining lease term	4 years 4 months 24 days	4 years 4 months 24 days
Weighted-average discount rate	10.26%	10.26%