XML 53 R44.htm IDEA: XBRL DOCUMENT
v3.20.1

License Agreements - Additional Information (Detail) |  |  | 1 Months Ended | 42 Months Ended
--- | --- | --- | --- | ---
Jan. 22, 2018 USD ($) | May 14, 2015 | Jul. 31, 2016 USD ($) | Dec. 31, 2019 USD ($) g
Sopharma [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
License agreement expiry date |  | May 26, 2029 |  |
University of Bristol [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Maximum amount payable under license agreement, tied to milestones |  |  | $ 3,200,000 |
Payments under license agreement |  |  |  | $ 125,000
License agreement expiry |  |  | 2036-07 |
Volume of cytisine provided as an initial contribution | g |  |  |  | 100
University of Bristol [Member] | Amendment to the University of Bristol License Agreement [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Maximum amount payable under license agreement, tied to milestones | $ 1,700,000 |  |  |
Payments under license agreement | $ 37,500 |  |  |
University of Bristol [Member] | Minimum [Member] | License Agreement [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Patent expiry date |  |  | Feb. 05, 2036 |

X
- Definition License agreement expiry date. + References No definition available. + Details
Name: | achv_LicenseAgreementExpiryDate
Namespace Prefix: | achv_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition License agreement expiry month. + References No definition available. + Details
Name: | achv_LicenseAgreementExpiryMonth
Namespace Prefix: | achv_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum required payment under license agreement upon completion of various milestones. + References No definition available. + Details
Name: | achv_MaximumRequiredPaymentUnderLicenseAgreementUponCompletionOfVariousMilestones
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Patent expiry date. + References No definition available. + Details
Name: | achv_PatentExpiryDate
Namespace Prefix: | achv_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payments under license agreement. + References No definition available. + Details
Name: | achv_PaymentsUnderLicenseAgreement
Namespace Prefix: | achv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Volume of cytisine provided under license agreement. + References No definition available. + Details
Name: | achv_VolumeOfCytisineProvidedUnderLicenseAgreement
Namespace Prefix: | achv_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CounterpartyNameAxis=achv_SopharmaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=achv_UniversityOfBristolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=achv_AmendmentToLicenseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=achv_LicenseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |