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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
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Discount on common shares, or any unamortized balance thereof, shown separately as a deduction from the applicable account(s) as circumstances require.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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The cash inflow from the additional capital contribution to the entity.

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Cash received on stock transaction after deduction of issuance costs.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Asset Acquisition, Milestone Payment

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Collaborative Arrangement, Amount Of Upfront Payment And Near-Term Milestone

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Collaborative Arrangement, Global Development Cost Sharing Percentage

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Collaboration and License Agreements - License Agreement with Astellas US LLC (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended
	Apr. 15, 2026	Jun. 30, 2026	Jun. 30, 2026
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Global development costs shared (as a percent)	40.00%
Sanofi Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Asset acquisition, milestone payment		$ 48,000
Astellas
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Upfront payments		240,000	$ 240,000
Sale of stock (in shares)	7,239,382
Issuance of common stock	$ 75,000
Net proceeds received	$ 75,700
Sale of stock (in USD per share)	$ 10.46
Discount on shares	$ 700
Global development costs shared (as a percent)	60.00%
Maximum future development, regulatory and ex-US sales milestone payments	$ 1,390,000
Maximum future development, regulatory and sales milestones payments	1,390,000
Potential amount	1,620,000
Astellas \| License and collaboration revenue
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Upfront payments	$ 239,300
Astellas \| VIR‑5500 Program License
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Decrease in research and development			5,000
Astellas \| Astellas Agreements
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Credit to prepaid expenses and other current assets		$ 5,000	$ 5,000