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Fair Value of the Purchaser and Non-Purchaser Warrants at Issuance (Details) | 6 Months Ended
--- | ---
Mar. 31, 2014
Senior Secured Convertible Debentures Set Schedule Title Here 1 | 1.56%
Senior Secured Convertible Debentures Set Schedule Title Here 2 | 5.00
Senior Secured Convertible Debentures Set Schedule Title Here 3 | 97.16%
Senior Secured Convertible Debentures Set Schedule Title Here 4 | 0.00%

X
- Definition Senior Secured Convertible Debentures Set Schedule Title Here 1 + References No definition available. + Details
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Namespace Prefix: | avxl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Senior Secured Convertible Debentures Set Schedule Title Here 4 + References No definition available. + Details
Name: | avxl_SetScheduleTitleHereZeroTwoTwoZeroTwoTwoSixFiveSixhXFXdBnpNFourNinet
Namespace Prefix: | avxl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Senior Secured Convertible Debentures Set Schedule Title Here 3 + References No definition available. + Details
Name: | avxl_SetScheduleTitleHereZeroTwoTwoZeroTwoTwoSixFiveSixLLxNineGrXtDLfm
Namespace Prefix: | avxl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Senior Secured Convertible Debentures Set Schedule Title Here 2 + References No definition available. + Details
Name: | avxl_SetScheduleTitleHereZeroTwoTwoZeroTwoTwoSixFiveSixNRkXOneVTTwSixnEight
Namespace Prefix: | avxl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration