Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Summary of Status of Company's Non-Vested Employee Stock Option Shares (Detail)

v3.2.0.727
Share-Based Compensation - Summary of Status of Company's Non-Vested Employee Stock Option Shares (Detail) - $ / shares
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Common Stock Award [Member]    
Schedule Of Nonvested Stock Option Activity [Line Items]    
Number of shares, Granted 282,509 177,607
Employee Stock Option [Member]    
Schedule Of Nonvested Stock Option Activity [Line Items]    
Number of shares, Beginning Balance 1,233,184  
Number of shares, Granted 2,304,000  
Number of shares, Vested (454,400)  
Number of shares, Forfeited (1,924,000)  
Number of shares, Ending Balance 1,158,784 1,233,184
Weighted average grant date fair value, Beginning Balance $ 0.11  
Weighted average grant date fair value, Granted 0.07 $ 0.91
Weighted average grant date fair value, Vested 0.14  
Weighted average grant date fair value, Forfeited 0.07  
Weighted average grant date fair value, Ending Balance $ 0.08 $ 0.11
Non Employee Stock Options [Member]    
Schedule Of Nonvested Stock Option Activity [Line Items]    
Number of shares, Granted 0 416,000
Number of shares, Ending Balance 288,000