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Acquisitions, Acquired Intangible Assets, and Goodwill - Goodwill (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Combination and Asset Acquisition [Abstract]
Change in carrying value of goodwill	$ 0
Goodwill	$ 1,991,000	$ 1,991,000	$ 0

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- References

No definition available.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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-Topic 350
-SubTopic 20
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
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-SubTopic 20
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- Definition

Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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