Segment and Geographic Information - Revenue by Major Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 385,961	$ 427,054	$ 405,966
Total revenue, percent	100.00%	100.00%	100.00%
United States:
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 48,315	$ 51,752	$ 33,677
Total revenue, percent	13.00%	12.00%	8.00%
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 337,646	$ 375,302	$ 372,289
Total revenue, percent	87.00%	88.00%	92.00%
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 193,590	$ 186,865	$ 165,582
Total revenue, percent	50.00%	44.00%	41.00%
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 44,547	$ 59,835	$ 55,596
Total revenue, percent	12.00%	14.00%	14.00%
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 42,286	$ 49,080	$ 44,067
Total revenue, percent	11.00%	12.00%	11.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 14,846	$ 31,322	$ 31,181
Total revenue, percent	4.00%	7.00%	8.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 26,916	$ 37,826	$ 67,704
Total revenue, percent	7.00%	9.00%	17.00%
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 15,461	$ 10,374	$ 8,159
Total revenue, percent	4.00%	3.00%	2.00%