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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Summary of Accounts Receivable
A summary of accounts receivable is as follows (in thousands):
 December 31,
 20192018
Oil, natural gas and NGL sales$22,281  $31,780  
Joint interest billing5,165  13,083  
Other2,315  1,935  
Total accounts receivable29,761  46,798  
Less: allowance for doubtful accounts(1,117) (1,295) 
Total accounts receivable, net$28,644  $45,503  
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, 2019, 2018 and 2017 (in thousands):
Year Ended December 31,
 201920182017
Beginning balance$1,295  $1,274  $880  
Additions charged to costs and expenses6  758  397  
Deductions(1)(184) (737) (3) 
Ending balance$1,117  $1,295  $1,274  
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(1)Deductions represent the write-off of receivables and collections of amounts for which an allowance had previously been established.