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BUSINESS COMBINATIONS - Pro forma information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Additional information    
Revenue since acquisition included in consolidated statements of operations $ 86,600  
Operating loss since acquisition included in consolidated statements of operations 304,000  
Acquisition-related costs included in selling, general and administrative expenses $ 2,907 $ 141
NRC    
Pro forma combined:    
Revenue   231,195
Net loss   $ (2,857)