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Summary of Significant Accounting Policies (Details 6) - Customer Concentration Risk - Revenue | 12 Months Ended
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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%

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