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Stockholders Equity and Stock Options - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Stockholders Equity Note [Abstract]
Number of shares, Outstanding	2,008,902
Number of shares, Granted	617,150
Number of shares, Forfeited	(80,090)
Number of shares, Outstanding	2,545,962	2,008,902
Number of shares, Exercisable as of September 30, 2021	944,249
Number of shares, Vested and expected to vest as of September 30, 2021	2,545,962
Weighted average exercise price, balance	$ 22.31
Weighted average exercise price, Granted	15.62
Weighted average exercise price, Forfeited	62.42
Weighted average exercise price, balance	19.43	$ 22.31
Weighted average exercise price, Exercisable as of September 30, 2021	29.29
Weighted average exercise price, Vested and expected to vest as of September 30, 2021	$ 19.43
Weighted average remaining contractual term, outstanding	7 years 9 months 18 days	7 years 10 months 24 days
Weighted average remaining contractual term, Exercisable as of September 30, 2021	5 years 9 months 18 days
Weighted average remaining contractual term, Vested and expected to vest as of September 30, 2021	7 years 9 months 18 days
Aggregate intrinsic value, outstanding	$ 0.4
Aggregate intrinsic value, Vested and expected to vest as of September 30, 2021	$ 0.4

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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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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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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 grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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