Stock-Based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended
	Jun. 30, 2016	Sep. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Nov. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance			13,991,631
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			1,413,904
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, forfeitures in period			113,388
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			148,144
2013 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition			1 year 4 months 28 days
Non-employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options			$ 20,264	$ 58,552
Non employee service share based compensation nonvested awards total compensation cost not yet recognized period for recognition1			$ 332,847
2013 Stock Plan [Member] | Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance					360,545
2014 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Shares Available For Grant Addition to Twenty Fifteen Stock Plan In Period	250,000	170,000
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms			The exercise price of an option cannot be less than the fair value of one share of common stock on the date of grant for incentive stock options or non-statutory stock options. The exercise price of an incentive stock option cannot be less than 110% of the fair value of one share of common stock on the date of grant for stockholders owning more than 10% of all classes of stock. Options are exercisable over periods not to exceed ten years (five years for incentive stock options granted to holders of 10% or more of the voting stock) from the grant date. Options may be granted with vesting terms as determined by the Board of Directors which generally include a one to five-year period or performance conditions or both. The pre-existing options were subsumed under the Plan.