Stock-Based Compensation Plan - Summary of 2011, 2017 and 2020 Stock Option Plan Activity (Details) - $ / shares	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Number of Stock Options
Exercised (in shares)	(56,059)
Weighted Average Exercise Price
Exercised (in usd per share)	$ 0.24
2011 Stock Option Plan
Number of Stock Options
Beginning Balance (in shares)	1,571,205	1,571,205
Granted (in shares)	0	0
Forfeited (in shares)	0	0
Ending Balance (in shares)	1,515,146	1,571,205
Vested (in shares)	1,515,146	1,482,528
Exercisable (in shares)	1,515,146
Weighted Average Exercise Price
Beginning Balance (in usd per share)	$ 0.59	$ 0.59
Granted (in usd per share)	0	0
Forfeited (in usd per share)	0	0
Ending Balance (in usd per share)	0.58	0.59
Vested (in usd per share)	0.58	$ 0.59
Exercisable (in usd per share)	$ 0.58
2017 Stock Option Plan
Number of Stock Options
Beginning Balance (in shares)	3,961,658	2,845,557
Granted (in shares)	0	1,116,106
Forfeited (in shares)	0	0
Ending Balance (in shares)	3,961,658	3,961,663
Exercisable (in shares)	3,538,672
Weighted Average Exercise Price
Beginning Balance (in usd per share)	$ 0.92	$ 0.92
Granted (in usd per share)	0	0.92
Forfeited (in usd per share)	0	0
Ending Balance (in usd per share)	0.92	$ 0.92
Vested (in usd per share)	0.92
Exercisable (in usd per share)	$ 0.92
2020 Stock Option Plan
Number of Stock Options
Beginning Balance (in shares)	0
Granted (in shares)	1,463,242
Forfeited (in shares)	(1,723)
Ending Balance (in shares)	1,461,519
Vested (in shares)	0
Exercisable (in shares)	0
Weighted Average Exercise Price
Beginning Balance (in usd per share)	$ 0
Granted (in usd per share)	11.16
Forfeited (in usd per share)	10.14
Ending Balance (in usd per share)	11.16
Exercisable (in usd per share)	$ 0

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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