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Restructuring Costs - Summary of Changes in Accrued Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 203
(Reversal) provision	$ 378	$ 0	1,717	$ 0
Usage			(1,831)
Currency translation			(11)
Ending balance	78		78
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			203
(Reversal) provision			(55)
Usage			(77)
Currency translation			(8)
Ending balance	63		63
Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			0
(Reversal) provision			1,318
Usage			(1,315)
Currency translation			(3)
Ending balance	0		0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			0
(Reversal) provision			454
Usage			(439)
Currency translation			0
Ending balance	$ 15		$ 15