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- Definition

The amount of reduction in milestone payments due upon performing specified services.

+ References

No definition available.

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- Definition

The amount due from the Company upon achievement of specified milestones, as part of a license agreement.

+ References

No definition available.

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- Definition

The amount of upfront payment paid during the period as part of a license agreement.

+ References

No definition available.

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- 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/2009/role/commonPracticeRef
-Topic 450
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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- Definition

Amount of increase (decrease) in obligation for operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of periodic reduction over lease term of carrying amount of right-of-use asset from operating lease.

+ References

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- Definition

Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity.

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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Commitments and Contingencies - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions		1 Months Ended	3 Months Ended			6 Months Ended
	Jan. 08, 2025 USD ($)	May 31, 2026 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 GBP (£)	Jan. 31, 2024 GBP (£)	Feb. 28, 2021 EUR (€)
Gain Contingencies [Line Items]
Extended lease term		3 years
Annual Base Rent		$ 600
Option to extend the lease		no
Increase to operating lease right-of-use assets and operating lease liabilities		$ 1,100
Decrease in operating lease liabilities and corresponding right-of-use asset		$ 300
Research and development Expense			$ 9,714	$ 6,575		$ 19,087	$ 23,902
Increase decrease in operating lease liability						5	(109)
ProBioGen Agreement [Member] \| Manufacturing Services [Member]
Gain Contingencies [Line Items]
Milestone Payment, Amount Reduced			1,200			1,200				€ 1.1
Mabworks Agreement [Member]
Gain Contingencies [Line Items]
Upfront Payment Paid	$ 9,000
Maximum [Member] \| ProBioGen Agreement [Member] \| Sales Milestones [Member]
Gain Contingencies [Line Items]
Milestone Payments			8,000			8,000				7.0
Development Regulatory and Commercial Milestones [Member] \| Maximum [Member] \| Acelyrin Asset Purchase Agreement [Member]
Gain Contingencies [Line Items]
Milestone Payments			157,500			157,500
Development and Regulatory Milestones [Member] \| Mabworks Agreement [Member]
Gain Contingencies [Line Items]
Milestone Payments	30,000
Development Regulatory Commercial and Sales Milestones Member] \| Maximum [Member] \| CRH Agreement [Member]
Gain Contingencies [Line Items]
Milestone Payments \| £								£ 141.4	£ 106.8
Development Manufacturing and Commercial [Member] \| Maximum [Member] \| ProBioGen Agreement [Member]
Gain Contingencies [Line Items]
Milestone Payments			11,400			11,400				€ 10.0
Commercial Milestones [Member] \| Mabworks Agreement [Member]
Gain Contingencies [Line Items]
Milestone Payments	$ 832,000
Milestone [Member] \| ProBioGen Agreement [Member]
Gain Contingencies [Line Items]
Research and development Expense			0	$ 800		0	$ 800
Milestone [Member] \| Mabworks Agreement [Member]
Gain Contingencies [Line Items]
Research and development Expense			$ 0			$ 0
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Gain Contingencies [Line Items]
Upfront Payment Paid					$ 9,000