Name:	bfly_BusinessCombinationPercentageCeaseToBeneficiallyOwnNumberOfSharesInRespectOfReclassificationOrRecapitalization
Namespace Prefix:	bfly_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Number of shares outstanding prior to business combination.

No definition available.

Name:	bfly_BusinessCombinationSharesOutstandingImmediatelyUponClosingOfConsummation
Namespace Prefix:	bfly_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Number of shares outstanding upon closing of business combination.

No definition available.

Name:	bfly_BusinessCombinationStockIssuedUponClosingConsummation
Namespace Prefix:	bfly_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Number of shares issued to certain institutional investors under subscription agreement.

No definition available.

Name:	bfly_BusinessCombinationSubscriptionAgreementSharesIssuedToInstitutionalInvestors
Namespace Prefix:	bfly_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the number of votes per share of common stock.

No definition available.

Name:	bfly_CommonStockNumberOfVotesPerShare
Namespace Prefix:	bfly_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

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

Maximum number of shares of common stock that could be issued in connection with the Forward Purchase agreement.

No definition available.

Name:	bfly_ForwardPurchaseAgreementMaximumNumberOfSharesPurchased
Namespace Prefix:	bfly_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Amount agreed by Forward Purchasers to purchase an aggregate number of shares of common stock, at a specified purchase price in excess of gross proceeds.

No definition available.

Name:	bfly_ForwardPurchaseAgreementMaximumValueOfSharesPurchased
Namespace Prefix:	bfly_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents information pertaining to conversion of outstanding debt into shares upon merger.

No definition available.

Name:	bfly_MergerAgreementRightToReceiveSharesAtEffectiveTimeConversionOfOutstandingDebtIntoShares
Namespace Prefix:	bfly_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Represents the right to receive shares upon conversion of shares held prior to effective time pursuant to merger agreement.

No definition available.

Name:	bfly_MergerAgreementRightToReceiveSharesAtEffectiveTimeUponConversion
Namespace Prefix:	bfly_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Represents the right to receive shares upon exercise of options prior to effective time pursuant to merger agreement.

No definition available.

Name:	bfly_MergerAgreementRightToReceiveSharesAtEffectiveTimeUponExerciseOfOption
Namespace Prefix:	bfly_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Amount of costs incurred for offering of Units in Initial Public Offering and Private Placement of Warrants.

No definition available.

Name:	bfly_OfferingCosts
Namespace Prefix:	bfly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of other costs incurred in connection with the offering of Units in Initial Public Offering and Private Placement of Warrants.

No definition available.

Name:	bfly_OtherOfferingCosts
Namespace Prefix:	bfly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The cash outflow for the purchase of investments that are held in a trust account.

No definition available.

Name:	bfly_PaymentsToInvestCashInTrustAccount
Namespace Prefix:	bfly_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the threshold percentage of Obligation to redeem Public Shares if entity does not complete a Business Combination.

No definition available.

Name:	bfly_PercentageObligationToRedeemPublicSharesIfEntityDoesNotCompleteBusinessCombination
Namespace Prefix:	bfly_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The cash inflow associated with the amount received from entity's first offering of units to the public.

No definition available.

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

Cash received from the sale of units in the Initial Public Offering and the Private Placement Warrants, net of offering costs.

No definition available.

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

Ratio applied to the conversion of stock, for example but not limited to, one share converted to two or two shares converted to one.

No definition available.

Name:	bfly_StockConversionRatio
Namespace Prefix:	bfly_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Amount of costs incurred for underwriting fees in connection with the offering of Units in Initial Public Offering and Private Placement of Warrants.

No definition available.

Name:	bfly_UnderwritingFees
Namespace Prefix:	bfly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Number of new units issued during the period. Each unit consists of one share of Class A common stock and one redeemable warrant.

No definition available.

Name:	bfly_UnitsIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	bfly_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(b))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Name:	us-gaap_AssetsHeldInTrustNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromIssuanceOfWarrants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

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

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Per share or per unit amount of equity securities issued.

No definition available.

Name:	us-gaap_SharesIssuedPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ClassOfWarrantOrRightAxis=bfly_PrivatePlacementWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ClassOfWarrantOrRightAxis=bfly_PublicSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_TypeOfArrangementAxis=bfly_ForwardPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=bfly_LegacyLongviewAcquisitionCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=bfly_LegacyButterflyNetworkIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bfly_LegacyButterflyStockholdersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bfly_LongviewStockHoldersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_SubsidiarySaleOfStockAxis=bfly_PipeInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: