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Net Loss per Share - Summary of Basic and Diluted Net loss per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net loss $ (10,873) $ (7,367)
Accruing dividends on Series A convertible preferred stock (592) (740)
Net loss attributable to common stockholders $ (11,465) $ (8,107)
Weighted average common shares outstanding-basic and diluted 1,717,808 457,971
Net loss per share attributable to common stockholders-basic and diluted $ (6.67) $ (17.70)