Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Obligations to Contract Research Organizations and External Service Providers (Details)

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Commitments and Contingencies - Obligations to Contract Research Organizations and External Service Providers (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Research and Development Arrangement  
Long-term Purchase Commitment [Line Items]  
Obligation for future services $ 1.2