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Accounts Payable and Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Accounts Payable and Accrued Liabilities [Abstract]  
Schedule of accounts payable and accrued liabilities
(in thousands)            
    As of December 31,  
    2018     2017  
             
Accounts payable   $ 7,670     $ 3,274  
Oil and gas revenue suspense     2,675       1,776  
Gathering and transportation payables     1,774       497  
Production taxes payable     1,860       214  
Drilling advances received from joint venture partner     -       245  
Accrued lease operating costs     3,155       684  
Accrued ad valorem taxes-current     3,474       1,054  
Accrued general and administrative expenses     3,111       2,473  
Accrued asset retirement obligation-current     3,099       380  
Accrued interest     955       247  
Accrued gas purchases     5,441       -  
Other liabilities     1,603       374  
                 
Total accounts payable and accrued liabilities   $ 34,816     $ 11,218