Segment, Geographic, Product and Significant Customer Information - Revenue Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Net revenues:
Total net revenues	$ 258,621	$ 221,129	$ 187,367
South Korea [Member]
Net revenues:
Total net revenues	94,082	44,735	30,572
China [Member]
Net revenues:
Total net revenues	29,826	43,460	17,373
Singapore [Member]
Net revenues:
Total net revenues	21,810	37,096	17,395
United States [Member]
Net revenues:
Total net revenues	33,983	29,887	36,720
Taiwan [Member]
Net revenues:
Total net revenues	20,147	27,189	46,715
Japan [Member]
Net revenues:
Total net revenues	41,979	26,604	31,140
Other [Member]
Net revenues:
Total net revenues	$ 16,794	$ 12,158	$ 7,452