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RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS - Additional Information (Details)	May 26, 2020 USD ($)
RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS
Increase warrant liabilities	$ 6,709,333
Increase to accumulated deficit	$ 248,500

X

- Definition

Amount of increase to accumulated deficit for transaction costs allocated to warrant laibility with a corresponding offset to additional paid in capital.

+ References

No definition available.

+ Details

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Namespace Prefix:	bfly_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of increase to warrant liabilities.

+ References

No definition available.

+ Details

Name:	bfly_IncreaseToWarrantLiabilities
Namespace Prefix:	bfly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingChangesAndErrorCorrectionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration