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Selected Statements of Operations Data (Details Textual) | 12 Months Ended
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Dec. 31, 2018 Customer Segment | Dec. 31, 2017 Customer | Dec. 31, 2016 Customer
Selected Statements of Operations Data (Textual) |  |  |
Number of reportable segments | Segment | 1 |  |
Percent of total revenues, major customer | 98.00% | 90.00% | 98.00%
United States [Member] | Revenues [Member] |  |  |
Selected Statements of Operations Data (Textual) |  |  |
Percent of total revenues, major customer | 63.00% | 66.00% | 62.00%
Number of customers | 2 | 1 | 1
Philippines [Member] | Revenues [Member] |  |  |
Selected Statements of Operations Data (Textual) |  |  |
Percent of total revenues, major customer | 18.00% | 12.00% | 17.00%
Number of customers | 1 | 1 | 1

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