Other Capital Stock Agreements (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Nov. 30, 2014	May 20, 2015
Schedule of Capitalization, Equity
Stock Issued During Period, Shares, New Issues	7,944,133
Offering Price Per Share	$ 7.035
Net Proceeds From Stock Offering	$ 201.9
Payments of Underwriting Discounts and Commissions	3.4
Payments of Stock Issuance Costs	$ 0.6
Stock Issued During Period to Invus, Shares	21,321,961
Common Stock, Shares Authorized Before Reverse Stock Split		900,000,000
Common Stock, Shares Authorized After Reverse Stock Split		225,000,000