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Schedule of Share-based Compensation, Stock Options, Activity (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 1 |  | $ 1,775,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZeroZhcZeroZkJMmBOne
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 2 |  | 2.94 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeDLFivetJSixHWPGRR
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 3 |  | (550,000)avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeFTwoGlvThreefwTwofwn
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 4 |  | 3.86 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeTPDFThreeLSThreekdLSeven
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 5 |  | (150,000)avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeLNThreeNinendMzMJTr
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 6 |  | 3.72 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeWEightSixZGKpwyVTX
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 7 |  | 2,000,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreephFivezZeroTgThreeTJzZero
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 8 |  | 0.40 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreebOnegcLJXDZeroTvZero
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 9 |  | 0.50 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeTwTwFKzHPsNinex
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 10 |  | 3,075,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeHnFourThreecXpDwqRh
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 11 |  | 1.26 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeThreeSSevenbnEightQrSGmS
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 12 |  | (705,000)avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeThreezkThreefNineBDQXZP
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 13 |  | 2.70 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeBSevenJvTdFivekzsdd
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 14 |  | 800,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeJSSixFiveSevenFiveqdNineTyn
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 15 |  | 0.32 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZPZeroVfQCrRBBg
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 16 |  | 0.25 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZeroQTSTFlLwrPv
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 17 |  | 3,170,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZerolRFourVMlNinevOnevK
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 18 |  | 0.70 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreehRBHFiveZKSevenRSevenOneP
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 19 |  | 2,100,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreepclryzFourKpCFOne
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 20 |  | 0.56 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeNKVNinerZFiveThreewMFFour
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 21 |  | 2,305,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreexEightDxNinehFNSixhTwoB
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 22 |  | 0.79 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeDJnlWGGyxGTh
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 1 | 3,075,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZerocrwZerosDBXNWFourF |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 2 | 1.26 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZerohCBWzFCTKThreeThreey |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 3 | (705,000)avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZeroWKLLhvzXFGZh |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 4 | 2.70 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZeroVbTshtQHNineVTC |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 5 | 800,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZerolNxOneWsVLpDCn |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 6 | 0.32 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZerohbLDvLFourRyTBX |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 7 | 0.25 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZeroEightdJqCXTwoOnewQDf |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 8 | 3,170,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZerobmTRvNineHrXbGG |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 9 | 0.70 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZerorBzVvprdKgPd |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 10 | 2,100,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZeroSixFourhlFGyTsWpt |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 11 | 0.56 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZerokJQcNinebZTwoTLyp |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 12 | $ 2,100,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZeroThreeyPVGRSevenhRJrV |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 13 | 0.56 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixEightEightZeroKNsJkThreefvXOneqW |

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