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Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net loss, basic and diluted $ (4,138) $ (3,592)
Weighted-average number of shares used in computing net loss per share, basic and diluted 906,048 762,007
Net loss per share, basic and diluted $ (4.57) $ (4.71)