XML 44 R32.htm IDEA: XBRL DOCUMENT
v3.26.1

Collaboration Revenue (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May 06, 2026 | Jun. 30, 2024 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Collaboration revenue |  |  | $ 21,000 | $ 0 | $ 21,000 | $ 0
Collaborative Arrangement |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Development and regulatory milestone payments |  | $ 515,000 |  |  |  |
Sales-based milestone payments |  | $ 740,000 | $ 21,000 |  | $ 21,000 |
Collaboration revenue | $ 21,000 |  |  |  |  |
Contingent consideration | $ 2,000 |  |  |  |  |
Non-compete covenant period | 18 months |  |  |  |  |
Expected contingent payment | $ 0 |  |  |  |  |

X
- Definition Collaborative Arrangement, Contingent Consideration + References No definition available. + Details
Name: | howl_CollaborativeArrangementContingentConsideration
Namespace Prefix: | howl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Collaborative Arrangement, Expected Contingent Consideration + References No definition available. + Details
Name: | howl_CollaborativeArrangementExpectedContingentConsideration
Namespace Prefix: | howl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Collaborative Arrangement, Non-Compete Covenant Period + References No definition available. + Details
Name: | howl_CollaborativeArrangementNonCompeteCovenantPeriod
Namespace Prefix: | howl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Development and Regulatory Milestones + References No definition available. + Details
Name: | howl_DevelopmentAndRegulatoryMilestones
Namespace Prefix: | howl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sales-Based Milestones + References No definition available. + Details
Name: | howl_SalesBasedMilestones
Namespace Prefix: | howl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 808 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479402/808-10-50-1 + Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue from collaborative arrangement. Excludes revenue from contract with customer under Topic 606. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 808 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479402/808-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 3 -SubTopic 10 -Topic 808 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479428/808-10-45-3 + Details
Name: | us-gaap_RevenueFromCollaborativeArrangementExcludingRevenueFromContractWithCustomer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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