Quarterly report pursuant to Section 13 or 15(d)

Research and Development Accruals (Details)

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Research and Development Accruals (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Consulting agreement, expense recognized $ 0.0 $ 0.0
Minimum    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Consulting agreement, contingent liability   1.5
Maximum    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Consulting agreement, contingent liability   $ 4.0