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Business Segments, Concentration of Credit Risk and Significant Customers - Significant Customers (Details) - customer | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Customer A |  |  |  |  |
Significant Customers |  |  |  |  |
Percentage of concentration risk | 43.00% |  | 44.00% |  |
Customer B |  |  |  |  |
Significant Customers |  |  |  |  |
Percentage of concentration risk | 24.00% | 41.00% | 15.00% | 47.00% |
Customer C |  |  |  |  |
Significant Customers |  |  |  |  |
Percentage of concentration risk | 15.00% | 25.00% | 15.00% | 23.00% |
Customer D |  |  |  |  |
Significant Customers |  |  |  |  |
Percentage of concentration risk |  | 13.00% |  | 12.00% |
Net accounts receivable | Credit concentration | One customer |  |  |  |  |
Significant Customers |  |  |  |  |
Percentage of concentration risk |  |  | 78.00% |  | 72.00%
Number of customers | 3 |  | 3 |  | 1

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