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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2017
Apr. 03, 2016
Jan. 01, 2017
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Capital lease maintenance commitment $ 2    
Total rent expense, net of sublease income 211 $ 198  
Wafer and finished goods inventory      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Outstanding commitment for purchases 1,500   $ 1,600
Other goods and services      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Total outstanding purchase obligations $ 882