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Net Loss per Share - Schedule of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share Basic [Line Items]    
Net loss attributable to common stockholders $ (26,694) $ (29,582)
Weighted average shares of common stock outstanding, basic and diluted 48,059,279 34,776,488
Net loss per share attributable to common stockholders $ (0.56) $ (0.85)
Common Stock [Member]    
Earnings Per Share Basic [Line Items]    
Weighted average shares of common stock outstanding, basic and diluted 48,059,279 34,776,488