Segment, Geographic, and Significant Customer Information - Revenue Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Net revenues:
Total net revenues	$ 324,523	$ 258,621	$ 221,129
South Korea [Member]
Net revenues:
Total net revenues	108,938	94,082	44,735
China [Member]
Net revenues:
Total net revenues	72,305	29,826	43,460
Japan [Member]
Net revenues:
Total net revenues	64,252	41,979	26,604
United States [Member]
Net revenues:
Total net revenues	29,415	33,983	29,887
Singapore [Member]
Net revenues:
Total net revenues	22,167	21,810	37,096
Taiwan [Member]
Net revenues:
Total net revenues	14,012	20,147	27,189
Other [Member]
Net revenues:
Total net revenues	$ 13,434	$ 16,794	$ 12,158