Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Summary of Non-Employee Stock Option Activity (Detail)

v3.2.0.727
Share-Based Compensation - Summary of Non-Employee Stock Option Activity (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Non Employee Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares, Outstanding, Beginning balance 416,000  
Number of shares, Granted   416,000
Number of shares, Exercised    
Number of shares, Forfeited    
Number of shares, Outstanding, Ending Balance 416,000 416,000
Number of shares, Vested or expected to vest 416,000  
Number of shares, Exercisable 128,000 24,000
Weighted average exercise price, Outstanding $ 0.52  
Weighted average exercise price, Granted   $ 0.52
Weighted average exercise price, Exercised    
Weighted average exercise price, Forfeited    
Weighted average exercise price, Outstanding $ 0.52 $ 0.52
Weighted average exercise price, Outstanding, Vested or expected to vest 0.52  
Weighted Average Exercise Price, Outstanding, Exercisable $ 0.48 $ 0.31
Weighted-average remaining life (years), Outstanding 5 years 10 months 24 days  
Weighted-average remaining life (years), Vested or expected to vest 5 years 10 months 24 days  
Weighted-average remaining life (years), Exercisable 4 years 4 months 17 days 4 years 8 months 23 days
Aggregate intrinsic value, Outstanding $ 49  
Aggregate intrinsic value, Vested or expected to vest 49  
Aggregate intrinsic value, Exercisable $ 49 $ 0
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares, Outstanding, Beginning balance 4,985,480 4,068,024
Number of shares, Granted 2,304,000 960,000
Number of shares, Exercised 55,379 19,535
Number of shares, Forfeited 2,011,671 23,009
Number of shares, Outstanding, Ending Balance 5,222,430 4,985,480
Number of shares, Vested or expected to vest 5,222,430  
Number of shares, Exercisable 4,063,646 3,752,296
Weighted average exercise price, Outstanding $ 0.42 $ 0.31
Weighted average exercise price, Forfeited 1.22 2.04
Weighted average exercise price, Outstanding 0.47 0.42
Weighted average exercise price, Outstanding, Vested or expected to vest 0.47  
Weighted Average Exercise Price, Outstanding, Exercisable $ 0.30 $ 0.29
Weighted-average remaining life (years), Outstanding 4 years 8 months 5 days  
Weighted-average remaining life (years), Vested or expected to vest 4 years 8 months 5 days  
Weighted-average remaining life (years), Exercisable 3 years 8 months 19 days 4 years 3 months 11 days
Aggregate intrinsic value, Vested or expected to vest $ 432,392  
Aggregate intrinsic value, Exercisable $ 432,392 $ 423,487
Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares, Forfeited 2,000,000