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Stockholders' Equity - Summary of Stock Option Activity (Detail) - $ / shares	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 0.19
Ending balance (in dollars per share)		$ 0.19
Options to purchase common stock
Outstanding Options
Beginning balance (in shares)	7,945,956	8,104,691	8,222,710	8,222,710
Granted (in shares)	0	0	0
Exercised (in shares)	(6,215)	0	(118,019)
Forfeited / canceled	0	(158,735)	0
Ending balance (in shares)	7,939,741	7,945,956	8,104,691	7,939,741	8,222,710
Vested and expected to vest (in shares)	7,108,987			7,108,987
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.19
Granted (in dollars per share)			0
Exercised (in dollars per share)	0.36		0.46
Forfeited / canceled (in dollars per share)		0.14	0
Ending balance (in dollars per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19
Weighted Average Remaining Contractual Life (in years)
Weighted Average Remaining Contractual Life (in years)	7 years 6 months 10 days	7 years 9 months 10 days	8 years 21 days		8 years 3 months 18 days

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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