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Significant Customers (Details) - Customer Concentration Risk | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Revenues |  |
Concentration Risk |  |
Concentration risk, percentage | 16.00% | 29.00%
Revenues | Customer A |  |
Concentration Risk |  |
Concentration risk, percentage | 16.00% | 18.20%
Revenues | Customer B |  |
Concentration Risk |  |
Concentration risk, percentage | 0.00% | 10.80%
Gross accounts receivable |  |
Concentration Risk |  |
Concentration risk, percentage | 31.00% | 37.30%
Gross accounts receivable | Customer A |  |
Concentration Risk |  |
Concentration risk, percentage | 21.00% | 24.90%
Gross accounts receivable | Customer B |  |
Concentration Risk |  |
Concentration risk, percentage | 10.00% | 12.40%

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