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Revenue Recognition
 3 Months Ended
Apr. 03, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
The following table summarizes disaggregated revenue information by geographic area based upon the customer's country of domicile (in thousands):
Three-months Ended
April 3, 2022April 4, 2021
Americas$126,658 $107,836 
Europe62,792 57,048 
Greater China48,406 38,238 
Other Asia44,551 35,905 
$282,407 $239,027 

The following table summarizes disaggregated revenue information by revenue type (in thousands):
Three-months Ended
April 3, 2022April 4, 2021
Standard products and services$257,880 $222,326 
Application-specific customer solutions24,527 16,701 
$282,407 $239,027 
Costs to Fulfill a Contract
Costs to fulfill a contract are included in "Prepaid expenses and other current assets" on the Consolidated Balance Sheet and amounted to $11,429,000 and $10,854,000 as of April 3, 2022 and December 31, 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 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 the allowance for credit losses activity for the three-month period ended April 3, 2022 (in thousands):
Balance as of December 31, 2021$776 
Write-offs, net of recoveries(10)
Balance as of April 3, 2022$766 
The following table summarizes the deferred revenue and customer deposits activity for the three-month period ended April 3, 2022 (in thousands):
Balance as of December 31, 2021$35,743 
Deferral of revenue billed in the current period, net of recognition41,913 
Recognition of revenue deferred in prior period(23,202)
Foreign exchange rate changes1 
Balance as of April 3, 2022$54,455 
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.