Stock-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Number of Shares
Balance at the beginning (in shares)	22,050,000
Granted (in shares)	2,475,000
Exercised (in shares)	(106,250)
Cancelled (in shares)	(40,000)
Forfeited (in shares)	(888,750)
Balance at the ending (in shares)	23,490,000	22,050,000
Exercisable (in shares)	8,690,000
Weighted Average Exercise Price
Balance outstanding (in dollars per share)	$ 0.07	$ 0.06
Granted (in dollars per share)	0.14
Exercised (in dollars per share)	0.05
Cancelled (in dollars per share)	0.05
Forfeited (in dollars per share)	0.05
Exercisable (in dollars per share)	$ 0.09
Weighted Average Remaining Contractual Term (Years)
Weighted average remaining contractual term	8 years 10 months 17 days	9 years 6 months 7 days
Weighted average remaining contractual term, exercisable	8 years 7 months 9 days