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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Summary of Accounts Receivable
A summary of accounts receivable is as follows (in thousands):
 December 31,
 20202019
Oil, natural gas and NGL sales$12,757 $22,281 
Joint interest billing6,421 5,165 
Other4,754 2,315 
Total accounts receivable23,932 29,761 
Less: allowance for doubtful accounts(4,356)(1,117)
Total accounts receivable, net$19,576 $28,644 
Balance and Activity in Allowance for Doubtful Accounts
The following table presents the balance and activity in the allowance for doubtful accounts for the years ended December 31, 2020 and 2019 (in thousands):
Year Ended December 31,
 20202019
Beginning balance$1,117 $1,295 
Additions charged to costs and expenses (1)3,239 6 
Deductions (2)— (184)
Ending balance$4,356 $1,117 
____________________
(1)The Company performed an assessment of receivable balances related to governmental and other regulatory items during the year ended December 31, 2020, and recorded a $2.5 million allowance that is non-recurring in nature.
(2)Deductions represent the write-off of receivables and collections of amounts for which an allowance had previously been established.