Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Commitments as a Result of Acquisitions (Details)

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Commitments and Contingencies - Commitments as a Result of Acquisitions (Details) (USD $)
Jun. 30, 2012
Jul. 31, 2011
Quantum [Member]
   
Commitments [Line Items]    
Maximum additional consideration as a result of acquisitions $ 1,150,000  
AEG [Member]
   
Commitments [Line Items]    
Maximum additional consideration as a result of acquisitions $ 5,000,000 $ 5,000,000