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Share-Based Payment Arrangements (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jul. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Outstanding 5,466,936us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 7,544,432us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
FalconStor Software, Inc., 2006 Incentive Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Authorized 13,455,546us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= falc_IncentiveStockPlanMember
  20,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= falc_IncentiveStockPlanMember
Shares Available for grant 3,726,452us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= falc_IncentiveStockPlanMember
   
Shares Outstanding 6,795,492us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= falc_IncentiveStockPlanMember
   
Last date for grant of shares May 17, 2016    
FalconStor Software, Inc., 2013 Outside Directors Equity Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Authorized 400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= falc_FalconStorSoftwareInc.2013OutsideDirectorsEquityCompensationPlanMember
   
Shares Available for grant 280,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= falc_FalconStorSoftwareInc.2013OutsideDirectorsEquityCompensationPlanMember
   
Shares Outstanding 103,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= falc_FalconStorSoftwareInc.2013OutsideDirectorsEquityCompensationPlanMember
   
Last date for grant of shares May 09, 2016