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Commitments (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Summary of Operating and Financing Lease Obligation
The payment schedule for the Company’s operating lease obligations as of December 31, 2021 is as follows:
 
(Thousands of dollars)
  
Operating
Leases
 
2022
    $ 601  
2023
      150  
    
 
 
  
Total undiscounted lease payments
    $ 751  
Less: Amount associated with discounting
      (59 ) 
    
 
 
  
Net operating lease liabilities
    $ 692  
    
 
 
  
Reconciliation of Liability for Plugging and Abandonment Costs
A reconciliation of the liability for plugging and abandonment costs for the years ended December 31, 2021 and 2020 is as follows:
 

 
  
Year Ended December 31,
 
(Thousands of dollars)
  
    2021    
 
  
    2020    
 
Asset retirement obligation at beginning of period
    $ 13,660      $ 21,118  
Liabilities incurred
      724        4  
Liabilities settled
      (1,047 )       (1,286 ) 
Liabilities divested
      (52 )       (5,731 ) 
Accretion expense
      642        856  
Revisions in estimated liabilities
      368        (1,301 ) 
    
 
 
     
 
 
  
Asset retirement obligation at end of period
    $ 14,295      $ 13,660