Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense – cost of revenue	$ 2,820	$ 2,797	$ 8,270	$ 7,554
Amortization expense – operating expenses	3,533	3,970	10,388	11,740
Total amortization expense	$ 6,353	$ 6,767	$ 18,658	$ 19,294

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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