LEGAL PROCEEDINGS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013
LEGAL PROCEEDINGS [Abstract]
Significant costs incurred in connection with administrative proceedings	$ 0

Legal expenses incurred in connection with intellectual property and patents.

No definition available.

Name:	affx_LegalExpensesAssociatedWithAdministrativeProceedings
Namespace Prefix:	affx_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration