Quarterly report pursuant to Section 13 or 15(d)

CRUDE OIL AND NATURAL GAS PROPERTIES - Narrative (Details)

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CRUDE OIL AND NATURAL GAS PROPERTIES - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 01, 2018
USD ($)
$ / shares
shares
Sep. 17, 2018
USD ($)
$ / shares
shares
Jul. 27, 2018
USD ($)
well
a
Jul. 17, 2018
well
a
Jun. 04, 2018
USD ($)
$ / shares
shares
Apr. 25, 2018
well
a
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Asset Acquisition [Line Items]                      
Development capital expenditures and purchases of properties that were in accounts payable and not yet paid in cash             $ 133,872 $ 85,068     $ 129,500
Total fair value of consideration transferred             8,400        
Cash consideration             $ 8,122 5,107      
Anticipated future period over which excluded costs will become subject to depletion             5 years        
Leases expired             $ 700 $ 3,800      
W Energy Acquisition                      
Asset Acquisition [Line Items]                      
Number of net PDP wells acquired (in wells) | well     27.2                
Number of net PDNP wells acquired (in wells) | well     5.9                
Net mineral acres acquired (in acres) | a     10,633                
Total fair value of consideration transferred $ 341,633                    
Cash consideration 97,838   $ 117,100                
Adjustment to consideration transferred $ 2,200               $ 17,000    
Number of shares issued (in shares) | shares 51,476,961 51,500,000                  
Value of shares transferred $ 220,836                    
Share price (in dollars per share) | $ / shares $ 4.29 $ 4.29                  
Contingent consideration $ 22,959                    
Pivotal Entities                      
Asset Acquisition [Line Items]                      
Number of net PDP wells acquired (in wells) | well       20.8              
Number of net PDNP wells acquired (in wells) | well       2.2              
Net mineral acres acquired (in acres) | a       444              
Total fair value of consideration transferred   $ 146,134                  
Cash consideration   48,189               $ 68,400  
Adjustment to consideration transferred   $ 7,800               $ 12,400  
Number of shares issued (in shares) | shares   25,753,578                  
Value of shares transferred   $ 88,592                  
Share price (in dollars per share) | $ / shares   $ 3.44                  
Contingent consideration   $ 9,353                  
Salt Creek Oil and Gas, LLC                      
Asset Acquisition [Line Items]                      
Number of gross PDP wells acquired (in wells) | well           64          
Number of net PDP wells acquired (in wells) | well           5.5          
Number of gross PDNP wells acquired (in wells) | well           31          
Number of net PDNP wells acquired (in wells) | well           1.5          
Net mineral acres acquired (in acres) | a           1,319          
Total fair value of consideration transferred         $ 59,978            
Cash consideration         $ 44,738            
Number of shares issued (in shares) | shares         6,000,000.0            
Value of shares transferred         $ 15,240            
Share price (in dollars per share) | $ / shares         $ 2.54