Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Summary of Significant Accounting Policies [Line Items]
Number of shares excluded from the computation of net loss per share	23,248,254	16,514,230
Foreign currency translation adjustment	$ 8.7		$ 6.5
Restricted Cash and Cash Equivalents, Noncurrent	$ 0.8		$ 0.8