Geographic and Significant Customer Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014 segment	Sep. 28, 2013
Segment Reporting [Abstract]
Number of operating segments			1
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenues	$ 27,133	$ 39,044	$ 126,738	$ 98,148
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenues	5,511	15,665	25,554	41,426
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenues	4,099	2,387	10,005	9,617
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenues	640	3,737	11,337	6,959
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenues	2,848	901	27,694	6,952
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenues	6,327	9,805	30,589	18,946
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenues	$ 7,708	$ 6,549	$ 21,559	$ 14,248