Stock-Based Compensation Plan - Summary of Stock Options Vested and Expected to Vest (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
2011 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Options outstanding, number of stock options (in shares)	1,260,328	1,571,205	1,571,205	1,647,650
Options exercisable, number of stock options (in shares)	1,260,328
Options outstanding, weighted average remaining contractual life (in years)	8 months 1 day
Options exercisable, weighted average remaining contractual life (in years)	8 months 1 day
Options outstanding exercise price (in usd per share)	$ 0.56	$ 0.59	$ 0.59	$ 0.60
Options exercisable, weighted average exercise price (in usd per share)	$ 0.56
2017 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Options outstanding, number of stock options (in shares)	3,936,176	3,961,658	2,845,557	2,599,669
Options exercisable, number of stock options (in shares)	3,538,672
Options outstanding, weighted average remaining contractual life (in years)	7 years 6 months 18 days
Options exercisable, weighted average remaining contractual life (in years)	7 years 5 months 4 days
Options outstanding exercise price (in usd per share)	$ 0.92	$ 0.92	$ 0.92	$ 0.92
Options exercisable, weighted average exercise price (in usd per share)	$ 0.92
2020 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Options outstanding, number of stock options (in shares)	1,469,297	0
Options exercisable, number of stock options (in shares)	0
Options outstanding, weighted average remaining contractual life (in years)	8 years 11 months 15 days
Options outstanding exercise price (in usd per share)	$ 11.12	$ 0
Options exercisable, weighted average exercise price (in usd per share)	$ 0