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Basic and Diluted Net Loss Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Net loss attributable to common stockholders $ (13,780) $ (6,482) $ (28,862) $ (11,524)
Weighted-average number of shares used in computing net loss per share, basic and diluted 11,989,866 11,938,401 11,976,799 10,472,180
Net loss available for common stockholders per share, basic and diluted $ (1.15) $ (0.54) $ (2.41) $ (1.10)