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Convertible Debt - Additional Information (Detail) (USD $)
6 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
May 17, 2013
Pyxis Innovations Inc [Member]
Line of Credit [Member]
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          
Convertible debt conversion price         $ 5.6783  
Debt Conversion, Converted Instrument, Shares Issued       2,521,222    
Debt Conversion, Converted Instrument, Amount 14,316,255 0        
Convertible Debt, Noncurrent $ 0   $ 14,316,255