Segment Reporting and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule of Revenue from External Customers by Products and Services

The following table lists the different sources of revenue:

	Year Ended December 31,
	2019				2018				2017
Systems and software	$	255,723	84	%	$	234,241	86	%	$	216,884	85	%
Parts		34,892	11	%		28,658	10	%		27,143	11	%
Services		15,281	5	%		10,885	4	%		11,071	4	%
Total revenue	$	305,896	100	%	$	273,784	100	%	$	255,098	100	%

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area

For geographical revenue reporting, revenue is attributed to the geographic location to which the product is shipped. Revenue by geographic region is as follows:

	Year Ended December 31,
	2019		2018		2017
Revenue from third parties:
United States	$	46,717	$	43,944	$	36,104
Taiwan		66,601		45,312		63,079
South Korea		43,997		51,750		44,180
Singapore		10,699		14,371		12,775
Japan		29,816		22,361		18,943
Germany		4,899		14,913		15,580
China		80,017		63,243		35,925
Other Europe		18,124		12,260		23,768
Other Asia		5,026		5,630		4,744
Total revenue	$	305,896	$	273,784	$	255,098