Leases - Summary of Components of Lease Expense (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 28, 2019 USD ($)	Jun. 28, 2019 USD ($)
Finance lease cost:
Amortization of right-of-use assets	$ 33	$ 66
Interest on lease liabilities	19	79
Operating lease cost	3,265	6,685
Short-term lease cost	394	639
Sublease income	(23)	(64)
Total lease cost	3,688	7,405
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	19	79
Operating cash flows from operating leases	3,670	7,108
Financing cash flows from finance leases	156	312
Property and equipment	3,636	3,636
Accumulated amortization	80	80
Property and equipment, net	3,556	3,556
Finance lease liabilities, current	486	486
Finance lease liabilities, non-current	2,667	2,667
Total finance lease liabilities	$ 3,153	$ 3,153
Weighted-average remaining lease term – finance leases	4 years 10 months 24 days	4 years 10 months 24 days
Weighted-average remaining lease term – operating leases	2 years 3 months 18 days	2 years 3 months 18 days
Weighted-average discount rate – finance leases	7.00%	7.00%
Weighted-average discount rate – operating leases	7.00%	7.00%