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v3.25.3

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (Unaudited) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2025 | Mar. 31, 2025
Common Stock and Pre-funded Warrants |  |
Stock issuance costs | $ 30.8 | $ 30.8

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- Definition Costs incurred in a stock issuance transaction. + References No definition available. + Details
Name: | beam_StockIssuanceCosts
Namespace Prefix: | beam_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=beam_CommonStockAndPreFundedWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |