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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
ATM Offering |  |
Stock issuance costs | $ 6.1 | $ 2.7

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

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