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Selected Statements of Operations Data (Details Textual) - Segment | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Selected Statements of Operations Data (Textual) |  |  |
Number of reportable segments | 1 |  |
Percent of total revenues | 96.00% | 98.00% | 90.00%

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