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Restructuring Expense (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]  
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent 13.00%us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent
Severance Costs $ 1.2us-gaap_SeveranceCosts1
Other Restructuring Costs 0us-gaap_OtherRestructuringCosts
Payments for Restructuring 0.7us-gaap_PaymentsForRestructuring
Restructuring Reserve, current 0.5us-gaap_RestructuringReserveCurrent
Research and Development Expense [Member]  
Restructuring Cost and Reserve [Line Items]  
Severance Costs 1.1us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Selling, General and Administrative Expenses [Member]  
Restructuring Cost and Reserve [Line Items]  
Severance Costs $ 0.1us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember