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Summary of Significant Accounting Policies - Research and Development Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cost of Sales [Member]      
Research and Development Assets Acquired Other than Through Business Combination [Line Items]      
Research and Development Expense $ 0.6 $ 0.8 $ 0.7