Significant Clients - Additional Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 02, 2021 USD ($) Client	Jun. 26, 2020 USD ($) Client	Jul. 02, 2021 USD ($) Client	Jun. 26, 2020 USD ($) Client	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Accounts receivable, net	$ 81,777		$ 81,777		$ 76,892
Number of major client \| Client	1	1	1	1
Number of other major client \| Client	0	0	0	0
IBM [Member]
Segment Reporting Information [Line Items]
Revenue	$ 19,600	$ 18,900	$ 39,200	$ 38,800
Services agreement expiration date	Oct. 27, 2023
Accounts receivable, net	$ 21,400		$ 21,400		$ 11,300
IBM [Member] \| Customer Concentration Risk [Member] \| Sales Revenue, Services, Net [Member]
Segment Reporting Information [Line Items]
Revenue, percent	21.20%	21.20%	20.70%	22.00%

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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