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Revenue Recognition
12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
The following table summarizes disaggregated revenue information by geographic area based on the customer's country of domicile (in thousands):
Year Ended December 31,
202220212020
Americas$390,573 $435,220 $310,027 
Europe234,643 247,744 208,787 
Greater China227,447 200,135 168,287 
Other Asia153,427 153,999 123,919 
$1,006,090 $1,037,098 $811,020 

The following table summarizes disaggregated revenue information by revenue type (in thousands):
Year Ended December 31,
202220212020
Standard products and services$848,153 $889,253 $674,830 
Application-specific customer solutions157,937 147,845 136,190 
$1,006,090 $1,037,098 $811,020 
Costs to Fulfill a Contract
Costs to fulfill a contract are included in "Prepaid expenses and other current assets" on the Consolidated Balance Sheets and amounted to $14,578,000 and $10,854,000 as of December 31, 2022 and 2021, respectively.
Accounts Receivable, Contract Assets, and Contract Liabilities
Accounts receivable represent amounts billed and currently due from customers which are reported at their net estimated realizable value. The Company maintains an allowance against its accounts receivable for credit losses. Contract assets consist of unbilled revenue which arises when revenue is recognized in advance of billing for primarily certain application-specific customer solutions contracts. Contract liabilities consist of deferred revenue and customer deposits which arise when amounts are billed to or collected from customers in advance of revenue recognition.
The following table summarizes changes in the allowance for credit losses (in thousands):
Amount
Balance as of December 31, 2020$831 
Increases to the allowance for credit losses— 
Write-offs, net of recoveries(55)
Foreign exchange rate changes— 
Balance as of December 31, 2021776 
Increases to the allowance for credit losses191 
Write-offs, net of recoveries(237)
Foreign exchange rate changes— 
Balance as of December 31, 2022$730 
The following table summarizes the deferred revenue and customer deposits activity (in thousands):
Amount
Balance as of December 31, 2020$21,274 
Deferral of revenue billed in the current period, net of recognition31,907 
Recognition of revenue deferred in prior period(17,403)
Foreign exchange rate changes(35)
Balance as of December 31, 202135,743 
Deferral of revenue billed in the current period, net of recognition39,076 
Recognition of revenue deferred in prior period(31,520)
Foreign exchange rate changes(2,512)
Balance as of December 31, 2022$40,787 
As a practical expedient, the Company has elected not to disclose the aggregate amount of the transaction price allocated to unsatisfied performance obligations, as our contracts have an original expected duration of less than one year.