Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - Revenue - Customer concentration - Significant customer - item
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Certain Risks and Concentrations        
Number of major customers 1      
Concentration risk percentage 84.00% 82.00% 79.00% 83.00%