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ACQUISITION - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Apr. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Equity loss recorded |  |  | $ (400) | $ (613) | $ (687) | $ 984
uSTAR |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash invested to acquire equity interest | $ 1,900 | $ 1,800 |  |  |  |
Equity method investment, ownership interest (as a percent) |  | 49.00% |  |  |  |
Interest owned after transaction | 100.00% |  | 100.00% | 100.00% |  |

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