XML 37 R29.htm IDEA: XBRL DOCUMENT
v3.25.2

Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Total assets | $ 54,727 |
Liabilities |  |
Total liabilities | 10,885 |
Fair Value, Measurements, Recurring [Member] | Convertible Debt [Member] |  |
Liabilities |  |
Total liabilities | 9,548 |
Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] |  |
Liabilities |  |
Total liabilities | 1,337 |
Fair Value, Measurements, Recurring [Member] | US Government Securities [Member] |  |
Assets |  |
Total assets | 2,737 |
Fair Value, Measurements, Recurring [Member] | Money market securities (cash equivalents) [Member] |  |
Assets |  |
Total assets | 51,184 |
Fair Value, Measurements, Recurring [Member] | Restricted cash [Member] |  |
Assets |  |
Total assets | 20 |
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member] |  |
Assets |  |
Total assets | 786 |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Total assets | 51,204 |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Money market securities (cash equivalents) [Member] |  |
Assets |  |
Total assets | 51,184 |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Restricted cash [Member] |  |
Assets |  |
Total assets | 20 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Total assets | 3,523 |
Liabilities |  |
Total liabilities | 9,548 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Convertible Debt [Member] |  |
Liabilities |  |
Total liabilities | 9,548 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Securities [Member] |  |
Assets |  |
Total assets | 2,737 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member] |  |
Assets |  |
Total assets | 786 |
Level 3 [Member] | Contingent Consideration [Member] |  |
Liabilities |  |
Total liabilities | 1,337 | $ 1,149
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities |  |
Total liabilities | 1,337 |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] |  |
Liabilities |  |
Total liabilities | $ 1,337 |

X
- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=achv_ContingentConsiderationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis=us-gaap_USGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=achv_RestrictedCashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |