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Net Loss Per Share - Summary of Antidilutive Securities Excluded From Computation of Earnings Per Share (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive effect 67,645,441 65,590,932 67,645,441 65,590,932
Convertible preferred stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive effect 59,883,877 59,883,877 59,883,877 59,883,877
Options to purchase common stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive effect 7,471,087 4,594,499 7,471,087 4,594,499
Unvested restricted stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive effect 290,477 1,112,556 290,477 1,112,556