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Warrants Issued and Outstanding (Detail) (Warrants, USD $)
3 Months Ended
Mar. 31, 2013
Warrants
 
Warrants Outstanding Number of underlying shares  
Beginning Balance 283,956
Granted/Vested 0
Forfeited 0
Ending Balance 283,956
Warrants Outstanding Weighted Average Exercise Price  
Beginning Balance $ 3.63
Ending Balance $ 3.63
Warrants Outstanding Average Remaining Contractual Life (yrs)  
Ending Balance 8 months 1 day
Warrants Exercisable Number of underlying shares  
Beginning Balance 283,956
Ending Balance 283,956
Warrants Exercisable Weighted Average Exercise Price  
Beginning Balance $ 3.63
Ending Balance $ 3.63
Warrants Exercisable Average Remaining Contractual Life (yrs)  
Ending Balance 8 months 1 day