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Commitments and Contingencies (Details1) - BFLY Operations Inc - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Long-term Purchase Commitment [Line Items] |  |  |
Rent expense |  | $ 2,100 | $ 1,900
Write-down of the vendor advance |  | 10,560 | 9,500
Expected losses on other purchase commitments |  | 6,900 |
Inventories [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Minimum inventory purchase commitments |  | 169,300 |
Prepaid vendor advance, net of write-downs |  | 36,400 | $ 46,900
Amount of increase to purchase commitment | $ 169,300 |  |
Net loss on vendor purchase commitment |  | 53,200 |
Write-downs and an accrual agreement |  | 42,600 |
Accrued purchase commitments |  | $ 42,600 |
Minimum [Member] | Inventories [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Fixed or minimum annual commitments period (in years) |  | 1 year |
Maximum [Member] | Inventories [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Fixed or minimum annual commitments period (in years) |  | 5 years |

X
- Definition Amount of accrued purchase commitments recorded as liability. + References No definition available. + Details
Name: | bfly_AccruedPurchaseCommitments
Namespace Prefix: | bfly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase to long term purchase commitment. + References No definition available. + Details
Name: | bfly_AmountOfIncreaseToLongTermPurchaseCommitment
Namespace Prefix: | bfly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expected credit losses on other purchase commitments. + References No definition available. + Details
Name: | bfly_ExpectedLossesOnOtherPurchaseCommitments
Namespace Prefix: | bfly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Company recognized a net loss on the vendor purchase commitment in product cost of revenue. + References No definition available. + Details
Name: | bfly_NetLossOnVendorPurchaseCommitment
Namespace Prefix: | bfly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of prepaid vendor advances net of write downs. + References No definition available. + Details
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Namespace Prefix: | bfly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of write down of vendor advances. + References No definition available. + Details
Name: | bfly_WriteDownOfVendorAdvances
Namespace Prefix: | bfly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of write-downs and an accrual agreement. + References No definition available. + Details
Name: | bfly_WriteDownsAndAccrualAgreement
Namespace Prefix: | bfly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |