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5. Product Warranty (Tables)
3 Months Ended
Apr. 01, 2017
Guarantees [Abstract]  
Schedule of warranty accrual
   Three Months Ended 
   April 1,
2017
   December 31,
2016
 
Beginning balance  $26   $42 
Standard accrual based on units sold   4    17 
Actual costs incurred   (4)   (16)
Periodic accrual adjustments   (4)   (17)
Ending balance  $22   $26