Annual report pursuant to section 13 and 15(d)

Share-based Compensation - Schedule of Stock Options Outstanding (Detail)

v2.4.0.8
Share-based Compensation - Schedule of Stock Options Outstanding (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
2007 Plan (Options) [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 1,593,334    
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 1 month 2 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.11 $ 2.21   
Options Exercisable, Number of Shares Exercisable 1,279,584    
Options Exercisable, Weighted-Average Exercise Price $ 2.21    
Inducement Stock Options [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 800,000    
Options Outstanding, Weighted-Average Remaining Contractual Life 4 years 10 months 13 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.25     
Options Exercisable, Number of Shares Exercisable       
Options Exercisable, Weighted-Average Exercise Price       
$1.50 - $1.75 [Member] | 2007 Plan (Options) [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 245,000    
Options Outstanding, Weighted-Average Remaining Contractual Life 2 years 8 months 9 days    
Options Outstanding, Weighted-Average Exercise Price $ 1.52    
Options Exercisable, Number of Shares Exercisable 45,000    
Options Exercisable, Weighted-Average Exercise Price $ 1.52    
$1.50 - $1.75 [Member] | Inducement Stock Options [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 400,000    
Options Outstanding, Weighted-Average Remaining Contractual Life 4 years 9 months 4 days    
Options Outstanding, Weighted-Average Exercise Price $ 1.75    
Options Exercisable, Number of Shares Exercisable       
Options Exercisable, Weighted-Average Exercise Price       
$1.76 - $2.00 [Member] | 2007 Plan (Options) [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 110,000    
Options Outstanding, Weighted-Average Remaining Contractual Life 4 years 4 days    
Options Outstanding, Weighted-Average Exercise Price $ 1.93    
Options Exercisable, Number of Shares Exercisable 33,750    
Options Exercisable, Weighted-Average Exercise Price $ 1.93    
$2.01 - 2.25 [Member] | 2007 Plan (Options) [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 1,238,334    
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 22 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.24    
Options Exercisable, Number of Shares Exercisable 1,200,834    
Options Exercisable, Weighted-Average Exercise Price $ 2.25    
$2.26 - $2.75 [Member] | Inducement Stock Options [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 400,000    
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 4 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.75    
Options Exercisable, Number of Shares Exercisable       
Options Exercisable, Weighted-Average Exercise Price