Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019		2018
Americas	$	310,027	$	277,155	265,175
Europe	208,787		227,738		311,914
Greater China	168,287		115,061		123,708
Other Asia	123,919		105,671		105,541
	$	811,020	$	725,625	$	806,338

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

	Year Ended December 31,
	2020		2019		2018
Standard products and services	$	674,830	$	629,220	$	654,509
Application-specific customer solutions	136,190		96,405		151,829
	$	811,020	$	725,625	$	806,338

Contract with Customer, Liability

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

	Amount
Balance as of December 31, 2018	$	9,845
Increases to deferred revenue and customer deposits	53,422
Recognition of revenue	(48,730)
Foreign exchange rate changes	(105)
Balance as of December 31, 2019	14,432
Increases to deferred revenue and customer deposits	120,008
Recognition of revenue	(114,014)
Foreign exchange rate changes	848
Balance as of December 31, 2020	$	21,274

Allowance for Credit Loss

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

	Amount
Balance as of December 31, 2018	$	596
Increases to the allowance for credit losses	215
Write-offs	(286)
Foreign exchange rate changes	5
Balance as of December 31, 2019	530
Increases to the allowance for credit losses	600
Write-offs	(300)
Foreign exchange rate changes	1
Balance as of December 31, 2020	$	831