CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Allocated share-based compensation expense	$ 23,599	$ 17,502
Amortization of acquisition intangible assets	2,623	3,368
Cost of revenue
Allocated share-based compensation expense	1,482	960
Amortization of acquisition intangible assets	1,490	2,010
Research and development
Allocated share-based compensation expense	9,497	6,457
Sales and marketing
Allocated share-based compensation expense	5,778	4,343
Amortization of acquisition intangible assets	1,133	1,358
General and administrative
Allocated share-based compensation expense	$ 6,842	$ 5,742

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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