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Equity Incentive Plan - Stock option activity (Details) - Plan - Options - BFLY Operations Inc - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Options      
Outstanding at beginning of year 14,692,333 13,673,551  
Granted 13,957,917 1,785,056  
Exercised (629,241) (171,730)  
Forfeited (2,297,410) (594,544)  
Outstanding at end of year 25,723,599 14,692,333 13,673,551
Options exercisable 11,126,920 9,788,082  
Vested and expected to vest 22,320,862 13,559,748  
Weighted Average Exercise Price      
Outstanding at beginning of year $ 2.35 $ 2.10  
Granted 5.77 4.31  
Exercised 3.19 1.89  
Forfeited 2.60 2.68  
Outstanding at end of year 4.18 2.35 $ 2.10
Options exercisable 2.38 1.90  
Vested and expected to vest $ 3.97 $ 2.27  
Weighted Average Remaining Contractual Term      
Outstanding weighted average remaining contractual term 7 years 22 days 6 years 11 months 9 days 7 years 8 months 27 days
Options exercisable 6 years 4 days 6 years 4 months 21 days  
Vested and expected to vest 6 years 11 months 9 days 6 years 10 months 6 days  
Aggregate Intrinsic Value      
Outstanding at beginning of year $ 47,820 $ 30,252  
Outstanding at end of year 143,338 47,820 $ 30,252
Options exercisable 82,033 36,207  
Vested and expected to vest $ 129,047 $ 45,138