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Stock-based Compensation - Summary of Share Option Plan (Detail)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options outstanding, Beginning balance | shares	15,955,892
Number of Options, Granted | shares	1,662,897
Number of Options, Exercised | shares	(1,722,880)
Number of Options, Forfeited | shares	(446,396)
Number of Options outstanding, Ending balance | shares	15,449,513
Number of Options, exercisable | shares	11,449,733
Weighted- Average Exercise price, Beginning balance | $ / shares	$ 0.71
Weighted- Average Exercise price, Granted | $ / shares	0.90
Weighted- Average Exercise price, Exercised | $ / shares	0.72
Weighted- Average Exercise price, Forfeited | $ / shares	0.84
Weighted- Average Exercise price, Ending balance | $ / shares	0.73
Weighted- Average Exercise price, exercisable | $ / shares	$ 0.68

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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 weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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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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 option holders acquired shares when converting their stock options into shares.

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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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