Net Loss Per Share - Computation of Diluted Weighted-Average Shares Outstanding (Detail) - shares		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total of common stock equivalents		5,135,016	5,688,356
Options to Purchase Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total of common stock equivalents		4,622,870	4,608,311
Nonvested restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total of common stock equivalents		501,255	927,189
Nonvested Founder Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total of common stock equivalents	[1]	10,891	152,856

[1] Represents 10,891 and 152,856 shares of common stock that are issued and outstanding but were subject to vesting based on service requirements at December 31, 2021 and 2020, respectively, and are not included in stockholders’ equity.