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STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE - Reserved Shares Narrative (Details)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Stockholders Equity And Share Based Compensation Expense [Abstract]    
Options outstanding 4,195us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 5,142us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options available for future grants 4,978us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance  
Convertible notes 17,857affx_CommonStockReservedForConvertibleSubordinatedNotes  
Total at December 31, 2014 27,030us-gaap_CommonStockCapitalSharesReservedForFutureIssuance