Annual report pursuant to section 13 and 15(d)

Performance Based Shares Activity (Detail)

v2.4.0.8
Performance Based Shares Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares        
Beginning Balance 706,803 737,020 670,355  
Granted 0 54,250 224,250  
Options exercised (108,146) 0 0  
Ending Balance 407,020 706,803 737,020  
Weighted Average Exercise Price        
Weighted Average Exercise Price, Beginning Balance $ 4.27 $ 4.26 $ 4.60  
Granted   $ 0.54 $ 2.32  
Options exercised $ 2.45      
Weighted Average Exercise Price, Ending Balance $ 4.52 $ 4.27 $ 4.26  
Performance Based Stock Options
        
Shares        
Beginning Balance 161,240 161,240 132,260  
Granted 0 0 130,000  
Options exercised           
Forfeited or expired 153,600   (101,020)  
Ending Balance 7,640 161,240 161,240 132,260
Exercisable at December 31, 2013 7,640      
Weighted Average Exercise Price        
Weighted Average Exercise Price, Beginning Balance $ 3.79 $ 3.79 $ 4.14  
Granted     $ 2.15  
Options exercised           
Forfeited or expired $ 3.71   $ 2.15  
Weighted Average Exercise Price, Ending Balance $ 5.30 $ 3.79 $ 3.79 $ 4.14
Exercisable at December 31, 2013 $ 5.30      
Weighted Average Remaining Contractual Term        
Weighted Average Remaining Contractual Term 5 years 5 months 12 days 4 years 10 months 28 days 6 years 8 months 27 days 6 years 2 months 5 days
Exercisable at December 31, 2013 5 years 5 months 12 days      
Aggregate Intrinsic Value        
Aggregate Intrinsic Value, Beginning Balance           
Aggregate Intrinsic Value, Ending Balance            
Exercisable at December 31, 2013