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Basic and Diluted Net Loss Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Net loss attributable to common stockholders $ (12,706) $ (7,694) $ (41,568) $ (19,218)
Weighted-average number of shares used in computing net loss per share, basic and diluted 12,022,620 11,942,729 11,992,240 10,967,750
Net loss available for common stockholders per share, basic and diluted $ (1.06) $ (0.64) $ (3.47) $ (1.75)