Supplementary Financial Statement Information (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Supplementary Financial Statement Information [Abstract] | ||
| Fair value estimate of services received | $ 583 | $ 425 |
| X | ||||||||||
- Definition Fair value estimate of services received. No definition available.
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| X | ||||||||||
- References No definition available.
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