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Commitments and Contingencies - Summary of Future Minimum Rental Payments under Operating Leases (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]        
Rental expense under operating leases $ 3,200 $ 2,200 $ 9,800 $ 6,100
Disclosure Summary Of Future Minimum Rental Payments Under Operating Leases [Abstract]        
Remainder of 2018 1,654   1,654  
2019 7,601   7,601  
2020 7,293   7,293  
2021 7,287   7,287  
2022 7,235   7,235  
Thereafter 41,796   41,796  
Total minimum lease payments $ 72,866   $ 72,866