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RELATED PARTY TRANSACTIONS - Narrative (Details)
$ in Thousands
3 Months Ended
Nov. 19, 2018
USD ($)
Mar. 31, 2020
USD ($)
individual
Mar. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Related Party Transaction [Line Items]        
Number of individuals to serve on the board of directors | individual   3    
B. Riley Financial, Inc.        
Related Party Transaction [Line Items]        
Total fees   $ 4,200 $ 2,100  
Financial advisory services | BPRI Executive Consulting, LLC        
Related Party Transaction [Line Items]        
Related party payments $ 750      
Cash bonus       $ 2,000
Babcock & Wilcox Enterprises, Inc. | B. Riley Capital Management, LLC        
Related Party Transaction [Line Items]        
Ownership percent of common stock   17.80%    
Babcock & Wilcox Enterprises, Inc. | Vintage Capital Management, LLC        
Related Party Transaction [Line Items]        
Ownership percent of common stock   33.90%