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Net Loss per Share - Schedule of Antidilutive Securities Excluded from Calculation of Diluted Net Loss per Share Attributable to Common Stockholders (Detail) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from calculation of diluted net loss per share 4,330,997 3,280,497
Options to Purchase Shares of Common Stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from calculation of diluted net loss per share 3,099,758 2,681,071
Unvested Restricted Stock Units [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from calculation of diluted net loss per share 1,011,955  
Unvested Shares of Common Stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from calculation of diluted net loss per share 219,284 599,426