Stockholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Mar. 30, 2016	Oct. 31, 2012
Schedule Of Stockholders Equity [Line Items]
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares issued	15,272,575	13,973,597	861,251
Common stock, shares outstanding	15,272,575	13,973,597
Employee stock purchase plan expense	$ 37,844	$ 61,023
Incentive Compensation Plan [Member] | Maximum [Member]
Schedule Of Stockholders Equity [Line Items]
Number of shares available for grant				7,500,000