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