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Goodwill and other identifiable intangible assets - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization of intangible assets $ 0.4 $ 0.6
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity    
2020 0.3  
2021 0.7  
2022 0.7  
2023 0.7  
2024 0.7  
2025 $ 0.7