Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
3 Months Ended
Sep. 18, 2020
Mar. 31, 2021
USD ($)
revenue_source
geographic_area
Mar. 31, 2020
USD ($)
Accounting Policies [Line Items]      
Reverse stock split ratio 0.1    
Number of revenue sources | revenue_source   2  
Number of geographic areas in which entity operates | geographic_area   1  
Oil      
Accounting Policies [Line Items]      
Sales   $ 135,600 $ 116,300
Natural Gas and NGL      
Accounting Policies [Line Items]      
Sales   21,700 13,900
Oil and Gas Sales      
Accounting Policies [Line Items]      
Sales   $ 157,331 $ 130,196
Oil and Gas Sales | Sales | Operator Concentration Risk | Top Four Operators      
Accounting Policies [Line Items]      
Concentration risk percentage   55.00% 53.00%