Segment, Geographic, Product and Significant Customer Information (Tables)

6 Months Ended

Jun. 27, 2015

Segment Reporting [Abstract]

Total net revenue

	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
Total net revenues:
United States	$	15,052	13,302		$	24,130	20,043
South Korea	7,370		8,373		22,013		24,262
Singapore	10,090		496		12,887		1,079
Taiwan	9,414		6,281		23,842		10,697
China	1,625		9,358		5,626		24,846
Other	5,078		10,219		10,507		18,678
Total net revenues	$	48,629	$	48,029	$	99,005	$	99,605

Long-lived tangible assets

Long-lived tangible assets:	June 27, 2015		December 27, 2014
United States	$	45,850	$	47,729
Taiwan	1,313		1,473
All Other	378		431
Total long-lived tangible assets	$	47,541	$	49,633

Customers accounted for 10% or more of total accounts receivable

The following customers accounted for 10% or more of total accounts receivable, net:

	At
	June 27, 2015		December 27, 2014
Micron	33	%	24	%
Taiwan Semiconductor Manufacturing Company Limited	20	%	20	%
SK Hynix	10	%	***
Samsung Electronics Co. Ltd.	***		10	%
Global Foundries	***		10	%

*** The customer accounted for less than 10% of total accounts receivable, net, as of that period end.

Customers accounted for 10% or more of total revenue

The following customers accounted for 10% or more of total net revenues:

	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
Micron	32	%	***		19	%	***
Taiwan Semiconductor Manufacturing Company Limited	17	%	11	%	20	%	***
SK Hynix	10	%	18	%	12	%	13	%
Samsung Electronics Co. Ltd.	***		16	%	20	%	35	%
Intel Corporation	***		18	%	***		16	%
Global Foundries	***		15	%	***		***

     *** The customer accounted for less than 10% of total net revenues during the period.