Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Basic and Diluted Net Loss Per Share - Additional Information (Detail)

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Basic and Diluted Net Loss Per Share - Additional Information (Detail) - Options For Purchase Of Ordinary Shares [Member] - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Line Items]      
Anti dilutive securities excluded in calculation of earnings per share 8,470,758 7,834,282 6,998,647
Series A Convertible Preferred Shares [Member]      
Earnings Per Share [Line Items]      
Anti dilutive securities excluded in calculation of earnings per share 20,418,209 20,418,209 20,418,209
Series B Convertible Preferred Shares [Member]      
Earnings Per Share [Line Items]      
Anti dilutive securities excluded in calculation of earnings per share 15,906,053 15,906,053 15,906,053
Series B-1 Convertible Preferred Shares [Member]      
Earnings Per Share [Line Items]      
Anti dilutive securities excluded in calculation of earnings per share 3,032,940 3,032,940 3,032,940
Series C Convertible Preferred Shares [Member]      
Earnings Per Share [Line Items]      
Anti dilutive securities excluded in calculation of earnings per share 28,216,005 28,216,005  
Series C-1 Convertible Preferred Shares [Member]      
Earnings Per Share [Line Items]      
Anti dilutive securities excluded in calculation of earnings per share 2,699,114