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ACQUISITION - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 28, 2018
Dec. 31, 2018
Dec. 31, 2018
Business Acquisition [Line Items]        
Equity loss recorded     $ (400) $ (613)
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%