Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Stock Option Activity (Detail)

v3.5.0.2
Stockholders' Equity - Stock Option Activity (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of shares, Options vested and expected to vest 1,779,365  
Number of shares, Options granted 0  
Number of shares, Options Forfeited (648,864)  
Number of shares, Options vested and expected to vest 1,130,501 1,779,365
Number of shares, Options vested and exercisable 1,065,501  
Weighted average exercise price, options vested and expected to vest $ 4.37  
Weighted average exercise price, options granted 0  
Weighted average exercise price, options Forfeited 0.51  
Weighted average exercise price, options vested and expected to vest 3.73 $ 4.37
Weighted average exercise price, options vested and exercisable $ 3.77  
Total weighted average intrinsic value, options vested and expected to vest $ 745,069 $ 666,396
Total weighted average intrinsic value, options granted 0  
Total weighted average intrinsic value, options Forfeited 0  
Total weighted average intrinsic value, options vested and expected to vest 745,069 $ 666,396
Total weighted average intrinsic value, options vested and exercisable $ 710,269  
Weighted average remaining contractual life,oOptions vested and expected to vest 5 years 2 months 5 days 6 years 3 months 25 days
Weighted average remaining contractual life,oOptions vested and exercisable 5 years 29 days