Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Share-based Compensation - Schedule of Stock Options Outstanding (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 3 months    
Options Outstanding, Weighted-Average Exercise Price $ 2.31 $ 2.31 $ 2.19
Options Exercisable, Number of Shares Exercisable 483,332    
Options Exercisable, Weighted-Average Exercise Price $ 2.29    
2014 Plan (Options) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number of shares outstanding 1,249,999    
Options Outstanding, Weighted-Average Remaining Contractual Life 4 years 3 months 4 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.80 2.79 2.69
Options Exercisable, Number of Shares Exercisable 616,597    
Options Exercisable, Weighted-Average Exercise Price $ 2.87    
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 3 months 4 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.25 $ 2.25 $ 2.25
Options Exercisable, Number of Shares Exercisable 756,250    
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 0 years    
Options Outstanding, Weighted-Average Exercise Price $ 1.51    
Options Exercisable, Number of Shares Exercisable 110,000    
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 3 months 4 days    
Options Outstanding, Weighted-Average Exercise Price $ 1.75    
Options Exercisable, Number of Shares Exercisable 381,250    
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 91,666    
Options Outstanding, Weighted-Average Remaining Contractual Life 0 years    
Options Outstanding, Weighted-Average Exercise Price $ 1.93    
Options Exercisable, Number of Shares Exercisable 91,666    
Options Exercisable, Weighted-Average Exercise Price $ 1.70    
$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 286,666    
Options Outstanding, Weighted-Average Remaining Contractual Life 3 months    
Options Outstanding, Weighted-Average Exercise Price $ 2.71    
Options Exercisable, Number of Shares Exercisable 281,666    
Options Exercisable, Weighted-Average Exercise Price $ 2.71    
$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 1,249,999    
Options Outstanding, Weighted-Average Remaining Contractual Life 4 years 3 months 4 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.80    
Options Exercisable, Number of Shares Exercisable 616,597    
Options Exercisable, Weighted-Average Exercise Price $ 2.87    
$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 2 years 3 months 4 days    
Options Outstanding, Weighted-Average Exercise Price $ 2.75    
Options Exercisable, Number of Shares Exercisable 375,000    
Options Exercisable, Weighted-Average Exercise Price $ 2.75