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CRUDE OIL AND NATURAL GAS PROPERTIES - Narrative (Details)
$ / shares in Units, a in Thousands
3 Months Ended
Jul. 01, 2019
USD ($)
well
a
$ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Asset Acquisition [Line Items]      
Anticipated future period over which excluded costs will become subject to depletion   5 years  
Leases expired   $ 1,700,000 $ 700,000
Independent Transactions      
Asset Acquisition [Line Items]      
Consideration transferred   25,500,000 $ 8,400,000
Development costs incurred prior to closing   $ 18,400,000  
VEN Bakken LLC      
Asset Acquisition [Line Items]      
Consideration transferred $ 315,280,000    
Number of net PDP wells acquired (in wells) | well 90.1    
Number of net PDNP wells acquired (in wells) | well 3.3    
Net mineral acres acquired (in acres) | a 18    
Cash consideration transferred $ 174,912,000    
Number of shares issued (in shares) | shares 5,602,147    
Value of shares transferred $ 11,708,000    
Share price (in dollars per share) | $ / shares $ 2.09    
Transaction costs $ 1,800,000    
VEN Bakken LLC | Senior Unsecured Notes      
Asset Acquisition [Line Items]      
Value of debt used in asset acquisition $ 128,700,000    
Interest rate 6.00%    
Principal amount $ 130,000,000.0