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License Agreements - Editas License Agreement - Additional Information (Details) | 6 Months Ended
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Jun. 30, 2021 USD ($)
Editas License Agreement |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |
Development regulatory and commercial milestones recognized | $ 0

X
- Definition The amount of expense recognized during the period for development, regulatory and commercial milestones. + References No definition available. + Details
Name: | beam_DevelopmentRegulatoryAndCommercialMilestonesRecognized
Namespace Prefix: | beam_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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 No definition available. + Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=beam_EditasLicenseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |