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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Number of shares excluded from the computation of net loss per share 23,250,163us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 15,359,430us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Foreign currency translation adjustment $ 9.7us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax   $ 6.5us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Restricted Cash and Cash Equivalents, Noncurrent $ 0.8us-gaap_RestrictedCashAndCashEquivalentsNoncurrent   $ 0.8us-gaap_RestrictedCashAndCashEquivalentsNoncurrent