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Commitments and Contingencies - Narrative (Details) - USD ($)
Jun. 30, 2019
Dec. 30, 2018
Purchase Commitment Excluding Longterm Commitment [Line Items]    
Purchase obligations due within next twelve months $ 12,000  
Wafer and finished goods inventory    
Purchase Commitment Excluding Longterm Commitment [Line Items]    
Outstanding commitment for purchases 74,000 $ 22,000
Other goods and services    
Purchase Commitment Excluding Longterm Commitment [Line Items]    
Total outstanding purchase obligations $ 1,200,000