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STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE - Share-based Compensation Plans Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options issue price as percentage of fair value 100.00%affx_ShareBasedCompensationArrangementsStockOptionsIssuePriceAsPercentageOfFairValue  
Stock options issue price as percentage of fair value, certain circumstances 110.00%affx_SharebasedCompensationArrangementsStockOptionsIssuePriceasPercentageofFairValueCertainCircumstances  
Options available for future grants (in shares) 4,978,000us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance  
Unrecognized share-based compensation expense $ 15.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition, Stock Options 2 years 2 months 15 days  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition, Restricted Stock 1 year 10 months 7 days  
Stock Plan 1998 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period - ending 10 years  
Number of shares authorized under plan (in shares) 3,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= affx_StockPlan1998Member
 
Stock Plan 2000 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized under plan (in shares) 16,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= affx_StockPlan2000Member
 
Additional shares authorized (in shares)   4,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= affx_StockPlan2000Member
Stock Plan 2012 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized under plan (in shares) 2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= affx_StockPlan2012Member
 
Employee stock options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period - beginning 7 years  
Expiration period - ending 10 years  
Vesting period 4 years  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting rights (in shares) 1affx_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsShares
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Restricted Stock [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years