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Warrants Issued and Outstanding (Detail) (Warrants, USD $)
9 Months Ended
Sep. 30, 2012
Warrants
 
Warrants Outstanding Number of underlying shares  
Balance, January 1, 2012 408,956
Granted/Vested   
Forfeited   
Exercised (125,000)
Balance, September 30, 2012 283,956
Warrants Outstanding Weighted Average Exercise Price  
Balance, January 1, 2012 $ 3.59
Exercised $ 3.50
Balance, September 30, 2012 $ 3.63
Warrants Outstanding Average Remaining Contractual Life (yrs)  
Balance, January 1, 2012 1 year 10 months 21 days
Exercised 0 years 0 months 0 days
Balance, September 30, 2012 1 year 2 months 1 day
Warrants Exercisable Number of underlying shares  
Balance, January 1, 2012 408,956
Granted/Vested   
Forfeited   
Exercised   
Balance, September 30, 2012 283,956
Warrants Exercisable Weighted Average Exercise Price  
Balance, January 1, 2012 $ 3.59
Exercised   
Balance, September 30, 2012 $ 3.63
Warrants Exercisable Average Remaining Contractual Life (yrs)  
Balance, January 1, 2012 1 year 10 months 21 days
Exercised 0 years 0 months 0 days
Balance, September 30, 2012 1 year 2 months 1 day