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Net Loss Per Share - Anti-dilutive common equivalent shares (Details) - BFLY Operations Inc - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive common equivalent shares 129,985,170 117,935,247
Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive common equivalent shares 26,742,256 14,692,333
Convertible Preferred Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive common equivalent shares 103,242,914 103,242,914