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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

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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_CommonStockAndPreFundedWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: