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Summary of Significant Accounting Policies (Details 6) - Customer Concentration Risk - Revenue
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Partner A      
Revenue, Major Customer      
Total revenues 27.00% 37.00% 33.00%
Partner B      
Revenue, Major Customer      
Total revenues 23.00% 31.00% 28.00%
Partner C      
Revenue, Major Customer      
Total revenues 18.00% 10.00% 14.00%