Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Summary of Significant Accounting Policies [Line Items]
Number of shares excluded from the computation of net loss per share	23,159,206	17,018,180
Foreign currency translation adjustment	$ 9.1		$ 6.5
Restricted Cash and Cash Equivalents, Noncurrent	$ 0.9		$ 0.8