Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Details) $ in Thousands	3 Months Ended
	Mar. 29, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	$ 1,276
Restructuring charges	1,236
Cash payments	(765)
Reclassification of reserves	(477)	[1]
Non-cash write-offs and other adjustments	(2)
Accrued expense ending balance	1,268
Severance
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	876
Restructuring charges	1,108
Cash payments	(744)
Non-cash write-offs and other adjustments	4
Accrued expense ending balance	1,244
Facility
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	388
Restructuring charges	89
Reclassification of reserves	(477)	[1]
Other Restructuring Charges
Restructuring Cost And Reserve [Line Items]
Accrued expense beginning balance	12
Restructuring charges	39
Cash payments	(21)
Non-cash write-offs and other adjustments	(6)
Accrued expense ending balance	$ 24

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