XML 25 R18.htm IDEA: XBRL DOCUMENT
v3.25.1

Fair Value Measurements (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
Fair Value Disclosures [Abstract] |
Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis, and indicates the fair value hierarchy of the valuation techniques we utilized to determine such fair value (in thousands):
March 31, 2025 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Money market securities (cash equivalents) |  | $ | 12,401 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,401 |
Restricted cash |  |  | 20 |  |  |  | — |  |  |  | — |  |  |  | 20 |
US government securities |  |  | — |  |  |  | 6,197 |  |  |  | — |  |  |  | 6,197 |
Corporate bonds |  |  | — |  |  |  | 3,642 |  |  |  | — |  |  |  | 3,642 |
Commercial paper |  |  | — |  |  |  | 390 |  |  |  | — |  |  |  | 390 |
Total assets |  | $ | 12,421 |  |  | $ | 10,229 |  |  | $ | — |  |  | $ | 22,650 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt |  | $ | — |  |  |  | 9,489 |  |  | $ | — |  |  | $ | 9,489 |
Contingent consideration |  |  | — |  |  |  | — |  |  |  | 1,240 |  |  |  | 1,240 |
Total liabilities |  | $ | — |  |  | $ | 9,489 |  |  | $ | 1,240 |  |  | $ | 10,729 |
Summary of Cash Equivalents | Cash equivalents consist of the following (in thousands):
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
March 31, 2025 |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Money market securities |  | $ | 12,401 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,401 |
Total cash equivalents |  | $ | 12,401 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,401 |
Money market securities (restricted cash) |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |
Total restricted cash |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |
Schedule of Corporate Bonds and Commercial Paper |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
March 31, 2025 |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
US government securities |  | $ | 6,196 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 6,197 |
Corporate bonds |  |  | 3,641 |  |  |  | — |  |  |  | 1 |  |  |  | 3,642 |
Commercial paper |  |  | 390 |  |  |  | — |  |  |  | — |  |  |  | 390 |
Total marketable securities |  | $ | 10,227 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 10,229 |
Schedule of Aggregate Fair Value of Principal Amount of Convertible Debt | The aggregate fair value of the principal amount of the convertible debt is a Level 2 fair value measurement.
|  | March 31, 2025 |  |  | December 31, 2024 |
|  | Principal |  |  | Carrying |  |  | Fair |  |  | Principal |  |  | Carrying |  |  | Fair |
|  | Amount |  |  | Value |  |  | Value |  |  | Amount |  |  | Value |  |  | Value |
2024 SVB Convertible Debt |  | $ | 10,000 |  |  | $ | 9,851 |  |  | $ | 9,489 |  |  | $ | 10,000 |  |  | $ | 9,837 |  |  | $ | 9,430 |
As of March 31, 2025 and December 31, 2024, the New Convertible Term Loan balance was comprised of the following:
| March 31, |  |  | December 31, |
| 2025 |  |  | 2024 |
New Convertible Term Loan Information |  |  |  |  |
Principal | $ | 10,000 |  |  | $ | 10,000 |
Transaction costs |  | (186 | ) |  |  | (186 | )
Amortization of transaction costs |  | 37 |  |  |  | 23 |
|  | 9,851 |  |  |  | 9,837 |
Schedule of Changes in Fair Value of Liabilities | The following table presents the changes in fair value of our total Level 3 financial liabilities for the three months ended March 31, 2025:
|  | Balance at |  |  | Change in |  |  | Balance at |
(in thousands) |  | December 31, 2024 |  |  | Fair Value |  |  | March 31, 2025 |
Contingent consideration |  | $ | 1,149 |  |  | $ | 91 |  |  | $ | 1,240 |

X
- Definition Schedule of changes in fair value of liabilities. + References No definition available. + Details
Name: | achv_ScheduleOfChangesInFairValueOfLiabilitiesTableTextBlock
Namespace Prefix: | achv_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
Name: | us-gaap_ConvertibleDebtTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 2: 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 + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 2: 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 + Details
Name: | us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration