Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 02, 2021	Apr. 02, 2021	Apr. 03, 2020	Apr. 03, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense – cost of revenue		$ 2,977	$ 2,734
Amortization expense – operating expenses	$ 3,575	3,575	3,445	$ 3,445
Total amortization expense		$ 6,552	$ 6,179

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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