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Summary of Warrants and Related Information (Detail) (Warrant, USD $)
6 Months Ended
Jun. 30, 2013
Warrant
 
Warrants  
Beginning balance 190,000
Granted   
Canceled   
Exercised   
Expired/Forfeited   
Ending Balance 190,000
Exercisable at June 30, 2013 190,000
Weighted-Average Exercise Price  
Beginning balance $ 19.8
Granted   
Canceled   
Exercised   
Expired/Forfeited   
Ending balance $ 19.80
Exercisable at June 30, 2013 $ 19.80