Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Share-based Compensation - Schedule of Stock Options Outstanding (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
2007 Plan (Options) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 488,332    
Options Outstanding, Weighted-Average Remaining Contractual Life 4 months 28 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.31 $ 2.19 $ 2.11
Options Exercisable, Number of Shares Exercisable 416,667    
Options Exercisable, Weighted-Average Exercise Price $ 2.33    
2014 Plan (Options) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 970,000    
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 6 months 29 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.79 2.69  
Options Exercisable, Number of Shares Exercisable 410,903    
Options Exercisable, Weighted-Average Exercise Price $ 2.85    
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 2 years 10 months 24 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.25 $ 2.25 $ 2.25
Options Exercisable, Number of Shares Exercisable 547,916    
Options Exercisable, Weighted-Average Exercise Price $ 2.25    
$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 110,000    
Options Outstanding, Weighted-Average Remaining Contractual Life 1 year 6 months    
Options Outstanding, Weighted-Average Exercise Price $ 1.51    
Options Exercisable, Number of Shares Exercisable 73,333    
Options Exercisable, Weighted-Average Exercise Price $ 1.51    
$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 2 years 9 months 22 days    
Options Outstanding, Weighted-Average Exercise Price $ 1.75    
Options Exercisable, Number of Shares Exercisable 272,916    
Options Exercisable, Weighted-Average Exercise Price $ 1.75    
$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 91,665    
Options Outstanding, Weighted-Average Remaining Contractual Life 1 year 2 months 12 days    
Options Outstanding, Weighted-Average Exercise Price $ 1.93    
Options Exercisable, Number of Shares Exercisable 84,167    
Options Exercisable, Weighted-Average Exercise Price $ 1.73    
$2.01 - $3.00 [Member] | 2007 Plan (Options) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 286,667    
Options Outstanding, Weighted-Average Remaining Contractual Life 4 months 10 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.71    
Options Exercisable, Number of Shares Exercisable 259,167    
Options Exercisable, Weighted-Average Exercise Price $ 2.69    
$2.01 - $3.00 [Member] | 2014 Plan (Options) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 970,000    
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 6 months 29 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.79    
Options Exercisable, Number of Shares Exercisable 410,903    
Options Exercisable, Weighted-Average Exercise Price $ 2.85    
$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 3 years 4 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.75    
Options Exercisable, Number of Shares Exercisable 275,000    
Options Exercisable, Weighted-Average Exercise Price $ 2.75