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Summary of Significant Accounting Policies - Additional Information (Details) - BFLY Operations Inc |  | 12 Months Ended
--- | --- | ---
Feb. 12, 2021 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($)
Gross proceeds from business combination | $ 589,000,000 |  |
Number of Operating Segments | segment |  | 1 |
Deferred offering costs |  | $ 3,711,000 | $ 0
Impairments |  |  | 0
Advertising expense |  | $ 4,700,000 | $ 900,000
Vesting period of stock options |  | 4 years |
Term of stock options |  | 10 years |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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