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Summary of Warrants and Related Information (Detail) (Warrant, USD $)
6 Months Ended
Jun. 30, 2012
Warrant
 
Warrants  
Beginning Balance 197,250
Granted   
Canceled   
Exercised   
Expired/Forfeited   
Ending Balance 197,250
Exercisable at June 30, 2012 197,250
Weighted-Average Exercise Price  
Beginning Balance $ 19.39
Granted   
Canceled   
Exercised   
Expired/Forfeited   
Ending Balance $ 19.39
Exercisable at June 30, 2012 $ 19.39