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Convertible Debt - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 1 Months Ended
Apr. 13, 2012
Mar. 31, 2013
Aug. 17, 2006
Pyxis Innovations Inc [Member]
Line Of Credit [Member]
Aug. 17, 2006
Pyxis Innovations Inc [Member]
Working Capital [Member]
Debt Instrument [Line Items]        
Working capital borrowings       $ 14,300,000
Credit facility extended date Mar. 31, 2014      
Amount borrowed under credit facility 1,316,255 14,300,000    
Fair value of convertible debt   0    
Accrued interest expense   $ 114,726    
Convertible debt conversion price     $ 5.6783  
Debt Conversion, Converted Instrument, Shares Issued     2,521,222