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Fair Value of the Purchaser and Non-Purchaser Warrants at Issuance (Details) (USD $)
 3 Months Ended
Dec. 31, 2014
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1 1.56%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeromRSevenkCFZsPMqv
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2 5.00avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroSkxfSixtgRfygw
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3 97.16%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroSQkLBNineRvxwnX
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZerowSTHkZeroEightSxEightTFive
Amendment Agreements [Member]  
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1 3.13%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZerozRFywSFourNTwoSixkC
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2 29.58avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroXmNineSVNNVXBZerog
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3 100.71%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroTzEightxtJGLqSevenRh
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroqQkXSevenWKJbylThree
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Embedded conversion options and warrants [Member]  
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1 2.59%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroTbrDzCNineTyhPl
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2 3.21%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroSevenSevenMZeroXxQmLBhF
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3 25.77avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroSeventGndwrNtFouryQ
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4 29.48avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroRmyPFiveDFivecSFiveHc
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 5 101.94%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroJnDyFyblSlSTwo
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 6 100.07%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeroZCSfbNineyHxTwoWR
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 7 0.185avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZerobZqlBdhwyFTN
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 8 0.184avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeronqSevenLNinezCSRlGR
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 9 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZeronBfgThreerVBzzrTwo
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 10 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixEightEightZerotFourJBwnLyshXEight
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