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Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details) | 12 Months Ended
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Sep. 30, 2014
Commitments Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 1 | 2.17%avxl_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSixFourOneThreeOneTwoThreeZeroFXRZxZeroKQxxp
Commitments Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 2 | 2.73%avxl_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSixFourOneThreeOneTwoThreeThreewNtvOneNineHsZXH
Commitments Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 3 | 6.50 avxl_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSixFourOneThreeOneTwoThreeBbnNrRdXxKWM
Commitments Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 4 | 91.21%avxl_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSixFourOneThreeOneTwoThreecQHQNtWJVmnW
Commitments Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 5 | 71.39%avxl_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSixFourOneThreeOneTwoThreeRXBSixFivewtwfBZr
Commitments Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 6 | 0.00%avxl_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSixFourOneThreeOneTwoThreemHCBzThreeWNineWThreeThreeThree
Commitments Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 7 | 0.00%avxl_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroTwoSixFourOneThreeOneTwoThreefPFourrEightNGLftgx

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