Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Details) $ in Thousands	6 Months Ended
	Jun. 28, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	$ 1,276
Restructuring charges	3,370
Cash payments	(1,897)
Reclassification of reserves	(477)	[1]
Non-cash write-offs and other adjustments	(964)
Accrued expense ending balance	1,308
Severance
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	876
Restructuring charges	2,281
Cash payments	(1,719)
Non-cash write-offs and other adjustments	(144)
Accrued expense ending balance	1,294
Facility
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	388
Restructuring charges	928
Cash payments	(19)
Reclassification of reserves	(477)	[1]
Non-cash write-offs and other adjustments	(820)
Other Restructuring Charges
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	12
Restructuring charges	161
Cash payments	(159)
Accrued expense ending balance	$ 14

[1] (a) Accrual related to exited facilities was reclassified to operating lease liabilities upon adoption of ASU 2016-02.