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Accrued Warranty (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 01, 2016
Jul. 03, 2015
Product Warranties Disclosures [Abstract]    
Balance at beginning of the period $ 3,335 $ 3,044
Provision charged to cost of revenue 639 1,524
Acquisition related warranty accrual 23 94
Use of provision (797) (730)
Divestiture of JK Lasers   (392)
Foreign currency exchange rate changes (21) (1)
Balance at end of period $ 3,179 $ 3,539