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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)	11 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020
Underwriting Agreement
Underwriting fee discount (in dollars per share)	$ 0.20
Underwriting expense	$ 8,280,000
Deferred underwriting discount (in dollars per share)	$ 0.35
Deferred underwriting fees	$ 14,490,000	$ 14,490,000	$ 14,490,000

X

- Definition

Per share deferred fee proceeds of an Initial Public Offering paid to the underwriter.

+ References

No definition available.

+ Details

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Namespace Prefix:	bfly_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Carrying value as of the balance sheet date of outstanding underwriting fee payable initially due after one year or beyond the operating cycle if longer, excluding current portion.

+ References

No definition available.

+ Details

Name:	bfly_DeferredUnderwritingFeePayableNonCurrent
Namespace Prefix:	bfly_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	bfly_UnderwritingAgreementAbstract
Namespace Prefix:	bfly_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Per share or per unit amount of underwriting discount.

+ References

No definition available.

+ Details

Name:	bfly_UnderwritingFeeDiscount
Namespace Prefix:	bfly_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration