Preferred Stock, Common Stock and Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding beginning balance	683,500
Shares, Granted	354,000
Shares, Outstanding ending balance	1,037,500	683,500
Shares, Vested and expected to vest at December 31, 2015	1,037,500
Shares, Exercisable at December 31, 2015	530,079
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Outstanding beginning balance	$ 7.67
Weighted Average Exercise Price, Granted	6.25
Weighted Average Exercise Price, Outstanding ending balance	7.19	$ 7.67
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2015	7.19
Weighted Average Exercise Price, Exercisable at December 31, 2015	$ 6.80
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding, Weighted Average Remaining Contractual Term [Abstract]
Weighted Average Remaining Contractual Term (Years), Outstanding	8 years 15 days	8 years 5 months 12 days
Weighted Average Remaining Contractual Term (Years), Granted	9 years 2 months 12 days
Weighted Average Remaining Contractual Term (Years), Vested and expected to vest at December 31, 2015	8 years 15 days
Weighted Average Remaining Contractual Term (Years), Exercisable at December 31, 2015	7 years 6 months
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding, Aggregate Intrinsic Value [Abstract]
Aggregate Intrinsic Value, Outstanding beginning balance	$ 649,000
Aggregate Intrinsic Value, Outstanding ending balance	342,200	$ 649,000
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2015	342,200
Aggregate Intrinsic Value, Exercisable at December 31, 2015	$ 342,200