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Revenue Recognition - Deferred Revenue and Customer Deposits Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Customer Contracts Liability, Current
Beginning balance	$ 25,035	$ 31,525
Deferred revenue and customer deposits	18,100	21,998
Recognition of revenue deferred in prior period	(22,728)	(28,108)
Foreign exchange rate changes	687	(380)
End balance	$ 21,094	$ 25,035

X

- Definition

Contract Liability Foreign Exchange Rate Changes

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Current And Prior Period Revenue Recognized

+ References

No definition available.

+ Details

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Namespace Prefix:	cgnx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Period Increase (Decrease)

+ References

No definition available.

+ Details

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Namespace Prefix:	cgnx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Customer Contracts Liability Current [Roll Forward]

+ References

No definition available.

+ Details

Name:	cgnx_CustomerContractsLiabilityCurrentRollForward
Namespace Prefix:	cgnx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

+ Details

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