Net Loss Per Share - Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net loss - basic and diluted	$ (18,699,450)	$ (12,090,287)
Weighted-average number of common shares - basic and diluted	11,352,230	8,633,897
Net loss per share - basic and diluted	$ (1.65)	$ (1.40)