Basic and Diluted Net Loss Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net loss, basic and diluted	$ (16,945)	$ (14,762)
Weighted-average number of shares used in computing net loss per share, basic and diluted	779,166	295,272
Net loss per share, basic and diluted	$ (21.75)	$ (49.99)