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Segment Information and Concentration of Business Risk, Revenue from Significant Partners (Details) - Partner | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Revenue [Member] | Customer Concentration [Member] | Partner A [Member] |  |  |  |  |
Significant Partners [Abstract] |  |  |  |  |
Concentration percentage | 72.00% | 74.00% | 58.00% | 57.00% |
Revenue [Member] | Customer Concentration [Member] | Partner B [Member] |  |  |  |  |
Significant Partners [Abstract] |  |  |  |  |
Concentration percentage | 10.00% | 4.00% | 21.00% | 4.00% |
Revenue [Member] | Customer Concentration [Member] | Partner C [Member] |  |  |  |  |
Significant Partners [Abstract] |  |  |  |  |
Concentration percentage | 5.00% | 8.00% | 10.00% | 6.00% |
Revenue [Member] | Customer Concentration [Member] | Partner D [Member] |  |  |  |  |
Significant Partners [Abstract] |  |  |  |  |
Concentration percentage | 8.00% | 0.00% | 3.00% | 0.00% |
Revenue [Member] | Customer Concentration [Member] | Partner E [Member] |  |  |  |  |
Significant Partners [Abstract] |  |  |  |  |
Concentration percentage | 1.00% | 0.00% | 1.00% | 19.00% |
Contracts Receivables [Member] | Credit Concentration [Member] | Significant Partners [Member] |  |  |  |  |
Significant Partners [Abstract] |  |  |  |  |
Concentration percentage |  |  | 84.00% |  | 84.00%
Number of significant partners |  |  | 2 |  | 2

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