Quarterly report pursuant to Section 13 or 15(d)

Research and Development Accruals (Details)

v3.8.0.1
Research and Development Accruals (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 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