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Stock Plans - Summary of Stock Options Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Options Outstanding
Beginning Balance (in shares)	10,432	8,995
Granted (in shares)	8,231	4,126
Exercised (in shares)	(9)	(2,043)
Cancelled/forfeited (in shares)	(5,366)	(646)
Ending Balance (in shares)	13,288	10,432	8,995
Vested and expected to vest (in shares)	13,288
Exercisable (in shares)	5,579
Weighted- Average Exercise Price
Beginning Balance (in USD per share)	$ 11.65	$ 7.19
Granted (in USD per share)	7.04	18.52
Exercised (in USD per share)	5.86	6.21
Cancelled/forfeited (in USD per share)	10.32	10.67
Ending Balance (in USD per share)	9.34	$ 11.65	$ 7.19
Vested and expected to vest (in USD per share)	9.34
Exercisable (in USD per share)	$ 10.32
Weighted- Average Remaining Contract Life (in years)
Weighted-Average Remaining Contractual Life	6 years 10 months 24 days	8 years 2 months 12 days	7 years 7 months 6 days
Vested and expected to vest	6 years 10 months 24 days
Exercisable	3 years 10 months 24 days
Outstanding, Aggregate Intrinsic Value	$ 145	$ 31,626	$ 48,073
Vested and expected to vest, Aggregate Intrinsic Value	145
Exercisable, Aggregate Intrinsic Value	$ 145

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

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

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