Annual report pursuant to section 13 and 15(d)

Performance Based Shares Activity (Detail)

v2.4.0.6
Performance Based Shares Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares      
Beginning Balance 737,020 670,355  
Granted 54,250 224,250  
Options exercised        
Ending Balance 706,803 737,020  
Weighted Average Exercise Price      
Weighted Average Exercise Price, Beginning Balance $ 4.26 $ 4.60  
Granted $ 0.54 $ 2.32  
Options exercised        
Weighted Average Exercise Price, Ending Balance $ 4.27 $ 4.26  
Performance Based Stock Options
      
Shares      
Beginning Balance 161,240 132,260  
Granted   130,000  
Options exercised        
Forfeited or expired   (101,020)  
Ending Balance 161,240 161,240 132,260
Exercisable at December 31, 2012 161,240    
Weighted Average Exercise Price      
Weighted Average Exercise Price, Beginning Balance $ 3.79 $ 4.14  
Granted   $ 2.15  
Options exercised        
Forfeited or expired   $ 2.15  
Weighted Average Exercise Price, Ending Balance $ 3.79 $ 3.79 $ 4.14
Exercisable at December 31, 2012 $ 3.79    
Weighted Average Remaining Contractual Term      
Weighted Average Remaining Contractual Term 4 years 10 months 28 days 6 years 8 months 27 days 6 years 2 months 5 days
Exercisable at December 31, 2012 4 years 10 months 28 days    
Aggregate Intrinsic Value      
Aggregate Intrinsic Value, Beginning Balance        
Aggregate Intrinsic Value, Ending Balance         
Exercisable at December 31, 2012