XML 44 R35.htm IDEA: XBRL DOCUMENT
v3.21.2

Common Stock - Summary of Outstanding Warrants (Detail) - $ / shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020
Warrants Issued In September 2017 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 411 |
Exercise price per Share | $ 699.200 |
Expiration Date | 2023-03 |
Warrants Issued In June 2018 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 114,100 |
Exercise price per Share | $ 80.000 |
Expiration Date | 2023-06 |
Warrants Issued in October 2018 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 31,215 |
Exercise price per Share | $ 62.890 |
Expiration Date | 2023-10 |
Warrants Issued in May 2019 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 60,000 |
Exercise price per Share | $ 90.000 |
Expiration Date | 2025-05 |
Warrants Issued in December 2019 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 614,141 |
Exercise price per Share | $ 6.600 | $ 6.60
Expiration Date | 2024-12 |
Warrants Issued in April 2020 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 182,461 |
Exercise price per Share | $ 7.240 |
Expiration Date | 2025-04 |
Warrants Issued in April 2020 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 24,375 |
Exercise price per Share | $ 7.320 |
Expiration Date | 2025-04 |
Warrants Issued in April 2020 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 25,270 |
Exercise price per Share | $ 7.590 |
Expiration Date | 2025-04 |
Pre-Funded Warrants Issued in August 2020 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 142,857 |
Exercise price per Share | $ 0.001 |
Warrants Issued in December 2020 [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 50,000 |
Exercise price per Share | $ 8.750 |
Expiration Date | 2025-12 |

X
- Definition Class of warrants or right expiration date. + References No definition available. + Details
Name: | achv_ClassOfWarrantsOrRightExpirationDate
Namespace Prefix: | achv_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInSeptemberTwoThousandSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInJuneTwoThousandEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInOctoberTwoThousandEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInMayTwoThousandNinteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInDecemberTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInAprilTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInAprilTwoThousandTwenty1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInAprilTwoThousandTwenty2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInAugustTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=achv_WarrantsIssuedInDecemberTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |