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Commitments and Contingencies (Details)
$ in Millions
Jun. 30, 2015
USD ($)
Recorded Unconditional Purchase Obligation [Line Items]  
Minimum purchase obligations due within one year $ 1.0
Pre-clinical Research Study Obligations [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Purchase obligation 9.2
Purchase obligation, due in next twelve months 5.2
Operating Lease Obligations [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual obligation 5.2
Contractual Obligation, due in next twelve months $ 2.2