Segment, Geographic, Product and Significant Customer Information - Revenue Net (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2016 USD ($)	Sep. 26, 2015 USD ($)	Sep. 24, 2016 USD ($) segment	Sep. 26, 2015 USD ($)
Revenues From External Customers And Long Lived Assets [Line Items]
Number of operating segments | segment			1
Net revenues:
Total net revenues	$ 58,714	$ 45,678	$ 161,970	$ 144,682
China [Member]
Net revenues:
Total net revenues	15,710	6,731	35,226	12,357
South Korea [Member]
Net revenues:
Total net revenues	11,765	6,794	24,669	28,807
United States [Member]
Net revenues:
Total net revenues	8,211	7,985	24,306	32,115
Singapore [Member]
Net revenues:
Total net revenues	7,364	2,988	33,883	15,875
Taiwan [Member]
Net revenues:
Total net revenues	6,334	11,331	16,962	35,173
Japan [Member]
Net revenues:
Total net revenues	5,078	7,778	18,645	15,919
Other [Member]
Net revenues:
Total net revenues	$ 4,252	$ 2,071	$ 8,279	$ 4,436