Revenue Recognition (Tables)

6 Months Ended

Jun. 28, 2019

Revenue From Contract With Customer [Abstract]

Customers as Percentage of Total Sales

The Company’s most significant customers (having accounted for 10% or more of sales) and their related sales as a percentage of total sales were as follows:  

	Three Months Ended						Six Months Ended
	June 28,			June 29,			June 28,			June 29,
	2019			2018			2019			2018
Lam Research Corporation		40.8	%		61.9	%		40.3	%		64.2	%
Applied Materials, Inc.		19.5			21.6			20.2			21.5
Total		60.3	%		83.5	%		60.5	%		85.7	%

Revenues Disaggregated by Revenue Segments

The following table presents the Company's revenues disaggregated by revenue segments (in thousands):

	Three Months Ended				Six Months Ended
	June 28,		June 29,		June 28,		June 29,
	2019		2018		2019		2018
Semiconductor Products and Solutions	$	210,390	$	290,213	$	410,635	$	605,055
Semiconductor Services Business		54,977		—		114,873		—
Total	$	265,367	$	290,213	$	525,508	$	605,055

Revenue by Geographic Area

The following table sets forth revenue by geographic area (in thousands):

	Three Months Ended				Six Months Ended
	June 28,		June 29,		June 28,		June 29,
	2019		2018		2019		2018
United States	$	133,000	$	159,187	$	270,254	$	343,962
China		12,422		16,812		20,430		18,978
Singapore		75,881		82,904		144,153		185,537
Austria		10,308		16,393		24,583		29,929
Korea		17,733		—		36,119
Other		16,023		14,917		29,969		26,649
	$	265,367	$	290,213	$	525,508	$	605,055