Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Amortization of intangible assets from acquisitions	$ 1,206	$ 1,568	$ 4,175	$ 4,704
Sales and Marketing
Amortization of intangible assets from acquisitions	437	618	1,616	1,855
General and Administrative
Amortization of intangible assets from acquisitions	141	376	547	1,127
Service Costs
Amortization of intangible assets from acquisitions	$ 628	$ 574	$ 2,012	$ 1,722

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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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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