Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2016	Sep. 30, 2016	Sep. 30, 2016
Chief Executive Officer
Subsequent Event [Line Items]
Severance costs		$ 5.6	$ 5.6
Subsequent Event | Chief Executive Officer
Subsequent Event [Line Items]
Consulting Fees, Payable	$ 0.5
Options granted (in shares)	6,539,290
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	2 years
Subsequent Event | Chief Executive Officer | Exercise Price, $0.3743
Subsequent Event [Line Items]
Options granted (in shares)	4,539,290
Exercise price (in dollars per share)	$ 0.3743
Subsequent Event | Chief Executive Officer | Exercise Price, $1.10
Subsequent Event [Line Items]
Options granted (in shares)	2,000,000
Exercise price (in dollars per share)	$ 1.10
Baxalta
Subsequent Event [Line Items]
Gain on termination of agreement		$ 4.2	$ 4.2