Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table summarizes disaggregated revenue information by geographic area based on the customer's country of domicile (in thousands):

	Year Ended December 31,
	2021		2020		2019
Americas	$	435,220	$	310,027	277,155
Europe	247,744		208,787		227,738
Greater China	200,135		168,287		115,061
Other Asia	153,999		123,919		105,671
	$	1,037,098	$	811,020	$	725,625

The following table summarizes disaggregated revenue information by revenue type (in thousands):

	Year Ended December 31,
	2021		2020		2019
Standard products and services	$	889,253	$	674,830	$	629,220
Application-specific customer solutions	147,845		136,190		96,405
	$	1,037,098	$	811,020	$	725,625

Contract with Customer, Liability

The following table summarizes the deferred revenue and customer deposits activity (in thousands):

	Amount
Balance as of December 31, 2019	$	14,432
Deferral of revenue billed in the current period, net of recognition	19,014
Recognition of revenue deferred in prior period	(12,443)
Foreign exchange rate changes	271
Balance as of December 31, 2020	21,274
Deferral of revenue billed in the current period, net of recognition	31,907
Recognition of revenue deferred in prior period	(17,403)
Foreign exchange rate changes	(35)
Balance as of December 31, 2021	$	35,743

Allowance for Credit Loss

The following table summarizes changes in the allowance for credit losses (in thousands):

	Amount
Balance as of December 31, 2019	$	530
Increases to the allowance for credit losses	600
Write-offs, net of recoveries	(300)
Foreign exchange rate changes	1
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, 2021	$	776