Annual report pursuant to section 13 and 15(d)

Non-Vested Shares (Detail)

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Non-Vested Shares (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Non-vested Shares      
Beginning Balance 706,803 737,020 670,355
Granted 0 54,250 224,250
Ending Balance 407,020 706,803 737,020
Weighted-Average Grant-Date Fair Value      
Granted   $ 0.39 $ 2.24
Nonvested Shares
      
Non-vested Shares      
Beginning Balance 5,602    
Granted       
Vested (767)    
Forfeited (4,168)    
Ending Balance 667    
Weighted-Average Grant-Date Fair Value      
Beginning Balance $ 0.99    
Granted       
Vested $ 2.39    
Forfeited $ 1.67    
Ending Balance $ 1.23