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Basic and Diluted Net Loss Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]    
Net loss attributable to common stockholders $ (30,055) $ (25,512)
Weighted-average number of shares used in computing net loss per share, basic and diluted 11,213,884 3,423,901
Net loss per share, basic and diluted $ (2.68) $ (7.45)