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GEOGRAPHIC AND SEGMENT INFORMATION (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) ReportableSegments | Dec. 31, 2017 USD ($)
Number of reportable operating segment | 3 | 3 |
Long-term assets | $ 24,848 | $ 25,778 | $ 42,400
United States |  |  |
Long-term assets | $ 24,400 | $ 25,800 | $ 24,400
Percentage of assets (as a percent) | 100.00% | 100.00% | 58.00%

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