Annual report pursuant to section 13 and 15(d)

Share-based Compensation - Summary of Stock Options and Inducement Stock Options Activity (Detail)

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Share-based Compensation - Summary of Stock Options and Inducement Stock Options Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
2007 Plan (Options) [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Authorized Shares, Options outstanding, beginning balance 1,375,000   
Number of Authorized Shares, Granted 245,000 1,375,000
Number of Authorized Shares, Exercised      
Number of Authorized Shares, Forfeited (26,666)   
Number of Authorized Shares, Options outstanding, ending balance 1,598,334 1,375,000
Number of Authorized Shares, Exercisable at December 31, 2013 1,279,584  
Weighted-Average Exercise Price, Outstanding, beginning balance $ 2.21   
Weighted-Average Exercise Price, Granted $ 1.52 $ 2.21
Weighted-Average Exercise Price, Exercised      
Weighted-Average Exercise Price, Forfeited $ 2.13   
Weighted-Average Exercise Price, Outstanding, ending balance $ 2.11 $ 2.21
Exercisable at December 31, 2013 $ 2.21  
Aggregate Intrinsic value, Outstanding, beginning balance      
Weighted-Average Remaining Contractual Term (in Years), Granted 2 years 8 months 9 days 3 years 7 months 13 days
Aggregate Intrinsic value, Outstanding, ending balance 53,083   
Weighted-Average Remaining Contractual Term (in Years) 3 years 1 month 2 days 3 years 7 months 13 days
Inducement Stock Options [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Authorized Shares, Options outstanding, beginning balance     
Number of Authorized Shares, Granted 800,000  
Number of Authorized Shares, Exercised     
Number of Authorized Shares, Forfeited     
Number of Authorized Shares, Options outstanding, ending balance 800,000  
Number of Authorized Shares, Exercisable at December 31, 2013     
Weighted-Average Exercise Price, Outstanding, beginning balance     
Weighted-Average Exercise Price, Granted $ 2.25  
Weighted-Average Exercise Price, Exercised     
Weighted-Average Exercise Price, Forfeited     
Weighted-Average Exercise Price, Outstanding, ending balance $ 2.25  
Exercisable at December 31, 2013     
Aggregate Intrinsic value, Outstanding, beginning balance     
Weighted-Average Remaining Contractual Term (in Years), Granted 4 years 10 months 13 days  
Aggregate Intrinsic value, Outstanding, ending balance $ 156,000  
Weighted-Average Remaining Contractual Term (in Years) 4 years 10 months 13 days