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Revenue
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
For the majority of transactions on the Company's platform, the Company reports revenue on a net basis as it does not act as the principal in the purchase and sale of digital advertising inventory because it does not have control of the digital advertising inventory and does not set prices agreed upon within the auction marketplace. For certain advertising campaigns that are transacted through insertion orders, the Company reports revenue on a gross basis, based primarily on its determination that the Company acts as the primary obligor in the delivery of advertising campaigns for buyers with respect to such transactions.
The following table presents the Company's revenue recognized on a net basis and on a gross basis for the three months ended March 31, 2024 and 2023:
Three Months Ended
March 31, 2024March 31, 2023
(in thousands, except percentages)
Revenue:
Net basis$121,092 81 %$107,457 83 %
Gross basis28,227 19 22,693 17 
Total$149,319 100 %$130,150 100 %
The following table presents the Company's revenue by channel for the three months ended March 31, 2024 and 2023:
Three Months Ended
March 31, 2024March 31, 2023
(in thousands, except percentages)
Channel:
CTV$72,592 49 %$59,050 45 %
Mobile53,953 36 48,184 37 
Desktop22,774 15 22,916 18 
Total$149,319 100 %$130,150 100 %
    The following table presents the Company's revenue disaggregated by geographic location, based on the location of the Company's sellers for the three months ended March 31, 2024 and 2023:
Three Months Ended
March 31, 2024March 31, 2023
(in thousands)
United States$113,412 $97,156 
International35,907 32,994 
Total$149,319 $130,150 

Payment terms are specified in agreements between the Company and the buyers and sellers on its platform. The Company generally bills buyers at the end of each month for the full purchase price of impressions filled in that month. The Company recognizes volume discounts as a reduction of revenue as they are incurred. Specific payment terms may vary by agreement, but are generally seventy-five days or less. The Company's accounts receivable are recorded at the amount of gross billings to buyers, net of allowances for the amounts the Company is responsible to collect. The Company's accounts payable related to amounts due to sellers are recorded at the net amount payable to sellers (see Note 5). Accordingly, both accounts receivable and accounts payable appear large in relation to revenue reported on a net basis.
Accounts receivable are recorded at the invoiced amount, are unsecured, and do not bear interest. The allowance for doubtful accounts is reviewed quarterly, requires judgment, and is based on the best estimate of the amount of probable credit losses in existing accounts receivable. The Company reviews the status of the then-outstanding accounts receivable on a customer-by-customer basis, taking into consideration the aging schedule of receivables, its historical collection experience, current information regarding the client, subsequent collection history, and other relevant data, in establishing the allowance for doubtful accounts. Accounts receivable are presented net of an allowance for doubtful accounts of $2.5 million at March 31, 2024, and $20.4 million at December 31, 2023. Accounts receivable are written off against the allowance for doubtful accounts when the Company determines amounts are no longer collectible.
The Company reviews the associated payable to sellers for recovery of buyer receivable allowance and write-offs; in some cases, the Company can reduce the payable to sellers. The reduction of seller payables related to recovery of uncollected buyer receivables is netted against allowance expense. The contra seller payables related to recoveries were $1.5 million and $1.1 million as of March 31, 2024 and December 31, 2023, respectively.
The following is a summary of activity in the allowance for doubtful accounts for the three months ended March 31, 2024 and 2023:
Three Months Ended
March 31, 2024March 31, 2023
(in thousands)
Allowance for doubtful accounts, beginning balance$20,363 $1,092 
Write-offs(18,511)(16)
Increase in provision for expected credit losses
615 586 
Allowance for doubtful accounts, ending balance$2,467 $1,662 
During the three months ended March 31, 2024 the Company wrote off $18.5 million of allowance for doubtful accounts, which was primarily attributable to the outstanding accounts receivable from a buyer that had filed for bankruptcy during 2023.
During the three months ended March 31, 2024, the provision for expected credit losses associated with accounts receivable increased by $0.6 million, offset by increases of contra seller payables related to recoveries of uncollected buyer receivables of $0.5 million, which resulted in $0.1 million of bad debt expense. During the three months ended March 31, 2023, the provision for expected credit losses associated with accounts receivable increased by $0.6 million, offset by increases of contra seller payables related to recoveries of uncollected buyer receivables of $0.5 million, which resulted in $0.1 million of bad debt expense.