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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

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- 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_
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Balance Type: | na
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- 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
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Namespace Prefix: | bfly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | bfly_
Data Type: | xbrli:stringItemType
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- Definition Per share or per unit amount of underwriting discount. + References No definition available. + Details
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Namespace Prefix: | bfly_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- 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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