Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Details) $ in Thousands	9 Months Ended
	Sep. 27, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	$ 1,276
Restructuring charges	4,836
Cash payments	(2,717)
Reclassification of reserves	(601)	[1]
Non-cash write-offs and other adjustments	(964)
Accrued expense ending balance	1,830
Severance
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	876
Restructuring charges	3,437
Cash payments	(2,381)
Non-cash write-offs and other adjustments	(144)
Accrued expense ending balance	1,788
Facility
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	388
Restructuring charges	975
Cash payments	58
Reclassification of reserves	(601)	[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	424
Cash payments	(394)
Accrued expense ending balance	$ 42

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