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Net Loss Per Share Attributable to Ordinary Shareholders - Summary of Shares Excluded From the Computation of Diluted Net Loss Per Share Attributable to Ordinary Shareholders (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from computation of diluted net loss per share 14,155,150 59,308,732 13,771,266 63,516,144
Convertible preferred shares [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from computation of diluted net loss per share 0 44,706,827 0 49,593,474
Outstanding share options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from computation of diluted net loss per share 10,810,724 14,212,886 11,577,203 13,636,488
Unvested RSUs [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from computation of diluted net loss per share 3,071,760 208,137 1,994,319 69,886
Share purchase rights under the ESPP [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from computation of diluted net loss per share 102,202 0 65,603 0
Issuable ordinary shares related to business combination [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from computation of diluted net loss per share 170,464 180,882 134,141 216,296