XML 35 R28.htm IDEA: XBRL DOCUMENT v3.25.1

Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Measurements, Recurring [Member]
Assets
Total assets	$ 22,650
Liabilities
Total liabilities	10,729
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets
Total assets	3,642
Fair Value, Measurements, Recurring [Member] | Convertible Debt [Member]
Liabilities
Total liabilities	9,489
Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]
Liabilities
Total liabilities	1,240
Fair Value, Measurements, Recurring [Member] | US Government Securities [Member]
Assets
Total assets	6,197
Fair Value, Measurements, Recurring [Member] | Money market securities (cash equivalents) [Member]
Assets
Total assets	12,401
Fair Value, Measurements, Recurring [Member] | Restricted cash [Member]
Assets
Total assets	20
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Assets
Total assets	390
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Total assets	12,421
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Money market securities (cash equivalents) [Member]
Assets
Total assets	12,401
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	10,229
Liabilities
Total liabilities	9,489
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets
Total assets	3,642
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Convertible Debt [Member]
Liabilities
Total liabilities	9,489
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Securities [Member]
Assets
Total assets	6,197
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Assets
Total assets	390
Level 3 [Member] | Contingent Consideration [Member]
Liabilities
Total liabilities	1,240	$ 1,149
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities
Total liabilities	1,240
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]
Liabilities
Total liabilities	$ 1,240

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_FinancialInstrumentAxis=us-gaap_CorporateBondSecuritiesMember
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: