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Option Activity (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding at January 1, 2012     2,228,400  
Granted     2,576,800  
Exercised (337,000) (20,000) (363,943) (20,000)
Expired (67,000) (29,000) (67,812) (104,000)
Forfeited (1,000) (120,000) (104,775) (234,000)
Outstanding at June 30, 2012 4,268,670   4,268,670  
Exercisable at June 30, 2012 1,322,756   1,322,756  
Outstanding at January 1, 2012     $ 3.17  
Granted     $ 1.49  
Exercised     $ 0.10  
Expired     $ 2.24  
Forfeited     $ 4.99  
Outstanding at June 30, 2012 $ 2.35   $ 2.35  
Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding at January 1, 2012     $ 0.01  
Granted     $ 0.01  
Exercised     $ 0.01  
Expired     $ 1.50  
Forfeited     $ 0.01  
Outstanding at June 30, 2012 $ 0.01   $ 0.01  
Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding at January 1, 2012     $ 5.50  
Granted     $ 3.40  
Exercised     $ 1.65  
Expired     $ 5.50  
Forfeited     $ 5.50  
Outstanding at June 30, 2012 $ 5.50   $ 5.50