Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Amortization of intangible assets from acquisitions	$ 5,331	$ 6,263
Sales and Marketing
Amortization of intangible assets from acquisitions	2,053	2,497
General and Administrative
Amortization of intangible assets from acquisitions	642	1,435
Service Costs
Amortization of intangible assets from acquisitions	$ 2,636	$ 2,331

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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