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STOCK OPTIONS AND WARRANTS - Transactions involving stock options issued to employees (Details 1) (Employee Stock Options, Incentive Stock Plan 2005, USD $)
3 Months Ended
Dec. 31, 2014
Employee Stock Options | Incentive Stock Plan 2005
 
Number of Shares  
Outstanding at October 1, 2014 2,909,046us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Granted 868,842us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Exercised   
Cancelled or expired   
Outstanding at December 31, 2014 3,777,888us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Vested at December 31, 2014 2,797,486us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Non-vested at December 31, 2014 980,402us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Weighted Average Exercise Price Per Share  
Outstanding at October 1, 2014 $ 4.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Granted $ 2.84us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Exercised   
Cancelled or expired   
Outstanding at December 31, 2014 $ 4.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Vested at December 31, 2014 $ 3.95apdn_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Aggregate Intrinsic Value, Vested at December 31, 2014 $ 0.76apdn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedGrantDateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member
Aggregate Intrinsic Value, Non-vested at December 31, 2014 $ 0.24apdn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedGrantDateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= apdn_IncentiveStockPlan2005Member