Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2022
Stock-Based Compensation.
Outstanding, number of shares (in shares)	5,598,009
Outstanding, weighted average exercise price (in dollars per share)	$ 4.19
Granted, number of shares (in shares)	4,485,277
Granted, weighted average exercise price (in dollars per share)	$ 5.22
Exercised, number of shares (in shares)	(193,331)
Exercised, weighted average exercise price (in dollars per share)	$ 3.81
Cancelled, number of shares (in shares)	(1,413,738)
Cancelled, weighted average exercise price (in dollars per share)	$ 5.79
Outstanding, number of shares (in shares)	8,476,217
Outstanding, weighted average exercise price (in dollars per share)	$ 4.48
Outstanding, weighted average contractual term (Year)	8 years 8 months 12 days
Outstanding, aggregate intrinsic value	$ 10,903
Exercisable, number of shares (in shares)	3,178,296
Exercisable, weighted average exercise price (in dollars per share)	$ 3.99
Exercisable, weighted average contractual term (Year)	7 years 10 months 24 days
Exercisable, aggregate intrinsic value	$ 6,622
Vested and expected to vest, number of shares (in shares)	7,887,409
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 4.46
Vested and expected to vest, weighted average contractual term (Year)	8 years 8 months 12 days
Vested and expected to vest, aggregate intrinsic value	$ 10,394