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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2017
Dec. 31, 2016
Restricted cash $ 3,100 $ 3,100
Minimum    
Estimated useful life - property and equipment 3 years  
Product warranty period 1 year  
Maximum    
Estimated useful life - property and equipment 7 years  
Product warranty period 3 years