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Summary of Significant Accounting Policies - Warranty (Details)	12 Months Ended
	Dec. 31, 2015
Minimum [Member]
Product Liability Contingency [Line Items]
Product Warranty Period	1 year
Maximum [Member]
Product Liability Contingency [Line Items]
Product Warranty Period	3 years

X

- Definition

Product warranty period.

+ References

No definition available.

+ Details

Name:	cgnx_ProductWarrantyPeriod
Namespace Prefix:	cgnx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ProductLiabilityContingencyLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: