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Stock-Based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Oct. 16, 2015
Mar. 25, 2015
Dec. 31, 2015
Dec. 31, 2014
Nov. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, capital shares reserved for future issuance     620,885    
Share Based Compensation Arrangements By Share Based Payment Award Options Assumed In Merger Weighted Average Exercise Price     $ 143.00    
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Assumed In Merger     1,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     1,413,904    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 6.90 $ 20.50      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 38.50 $ 38.50      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term     9 years 1 month 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms     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    
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     62,945    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     230,048    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years 4 years      
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year 1 year      
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 5 months 23 days    
Non-employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options     $ 314,505 $ 1,316,036  
Non employee service share based compensation nonvested awards total compensation cost not yet recognized period for recognition1     $ 1,446,075    
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, Options, Grants in Period, Gross 177,446 143,266      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term 10 years 10 years      
Share Based Compensation Arrangement By Share Based Payment Award Shares Available For Grant Addition to Twenty Fifteen Stock Plan In Period     170,000    
Stock option one [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 142,063 126,985      
Stock option one [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term   3 years 1 month 6 days      
Stock option one [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term   2 years 1 month 6 days      
Stock Option Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage for closing price of common stock   48.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 35,383 16,282      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 3.10 $ 11.40