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Income Taxes - Income (loss) before provision for income taxes (Details) - USD ($)
11 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Loss before provision for income taxes $ (132,168,136)    
BFLY Operations Inc      
Federal   $ (162,876,000) $ (98,833,000)
Foreign   170,000 (864,000)
Loss before provision for income taxes   $ (162,706,000) $ (99,697,000)