Segment, Geographic, Product and Significant Customer Information - Net Revenue (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014 segment	Dec. 28, 2013	Dec. 29, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments	1
Total net revenues:
Total net revenues	$ 166,443	$ 144,307	$ 182,881
United States [Member]
Total net revenues:
Total net revenues	36,123	47,019	44,811
South Korea [Member]
Total net revenues:
Total net revenues	41,381	34,873	79,555
China [Member]
Total net revenues:
Total net revenues	28,702	13,063	5,323
Taiwan [Member]
Total net revenues:
Total net revenues	19,790	9,645	16,757
Other [Member]
Total net revenues:
Total net revenues	$ 40,447	$ 39,707	$ 36,435