General form of registration statement for all companies including face-amount certificate companies

Stock-Based Compensation - Option Award Valuation Assumptions (Details)

v3.21.1
Stock-Based Compensation - Option Award Valuation Assumptions (Details) - $ / shares
6 Months Ended 12 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Price per unit       $ 1.50
Blade Urban Air Mobility [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Price per unit $ 7.28 $ 0.13    
Exercise price $ 7.28 $ 0.13    
Dividend yield 0.00% 0.00% 0.00%  
Expected volatility 60.00% 60.00% 60.00%  
Risk-Free interest rate 0.63%      
Expected life (in years) 6 years 29 days      
Blade Urban Air Mobility [Member] | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Price per unit     $ 0.44  
Exercise price     $ 0.44  
Risk-Free interest rate   0.14% 1.88%  
Expected life (in years)   2 years 4 months 24 days 5 years 5 months 23 days  
Blade Urban Air Mobility [Member] | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Price per unit     $ 0.48  
Exercise price     $ 0.48  
Risk-Free interest rate   0.44% 2.99%  
Expected life (in years)   6 years 29 days 6 years 29 days