Revenues - Narrative (Details) - USD ($) $ in Thousands	Apr. 04, 2021	Dec. 31, 2020	Mar. 29, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Contract with customer, deferred revenues	$ 83,763	$ 77,648	$ 69,485	$ 70,070
Contract with customer, deferred revenues, current	58,000
Contract with customer, deferred revenues, noncurrent	25,800
Deferred sales commission	6,100		$ 3,000
Service-Type Warranties
Disaggregation of Revenue [Line Items]
Contract with customer, deferred revenues	10,900
Contract with customer, deferred revenues, current	3,900
Contract with customer, deferred revenues, noncurrent	$ 7,000