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Subsequent Events - Schedule of Purchase Obligation in Future Period (Detail) - Biovest International, Inc. ("Biovest") [Member] - Subsequent Event [Member]
Oct. 08, 2015
USD ($)
Subsequent Event [Line Items]  
2016 $ 1,500,000
2017 1,500,000
2018 500,000
2019 500,000
Total $ 4,000,000