v3.26.1

Leases (Additional Information) (Details)		3 Months Ended
Leases (Additional Information) (Details)	Dec. 14, 2021 USD ($) ft²	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Apr. 30, 2023 ft²	Mar. 31, 2021 ft²
Lessee, Lease, Description [Line Items]
Finance Lease		$ 0
Right-of-use assets and operating lease liabilities		(434,000)	$ (283,000)
Amortization of ROU assets		643,000	$ 574,000
Hochbergerstrasse [Member]
Lessee, Lease, Description [Line Items]
Land Subject to Ground Leases \| ft²					21,422
Hochbergerstrasse [Member] \| Maximum [Member]
Lessee, Lease, Description [Line Items]
Land Subject to Ground Leases \| ft²				44,685
Hochbergerstrasse [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Land Subject to Ground Leases \| ft²				21,422
Harrison Street [Member]
Lessee, Lease, Description [Line Items]
Land Subject to Ground Leases \| ft²	63,327
Lease commencement date	Apr. 01, 2022
Initial lease term	128 months
Renewal term	5 years
Lease annual base rent per square foot	$ 95
Increase in annual base rent (Percentage)	3.00%
Klybeckstrasse Lease [Member]
Lessee, Lease, Description [Line Items]
Right-of-use assets and operating lease liabilities		$ 1,000,000

Increase in annual base rent (Percentage)

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Lease Commencement Date

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Area of land subject to a ground lease.

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Monte Rosa Therapeutics, Inc. 10-Q