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

Stock-Based Compensation - Equity Incentive Plan & Option Awards (Details)

v3.21.1
Stock-Based Compensation - Equity Incentive Plan & Option Awards (Details)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Dec. 14, 2020
$ / shares
shares
Jul. 28, 2020
USD ($)
installment
$ / shares
shares
Jul. 11, 2019
USD ($)
installment
$ / shares
shares
Nov. 16, 2018
USD ($)
installment
$ / shares
shares
Mar. 31, 2021
$ / shares
shares
Sep. 30, 2020
$ / shares
shares
Sep. 30, 2019
$ / shares
shares
Apr. 07, 2015
shares
Vesting over the following three years                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period       3 years        
Blade Urban Air Mobility [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized | shares               15,534,409
Number of options granted | shares 15,000     4,155,287 15,000 2,200,532 5,076,337  
Exercise price | $ / shares $ 7.28     $ 0.44 $ 7.28 $ 0.13 $ 0.45  
Term of option 10 years     10 years        
Grant date fair value | $ / shares $ 4.00       $ 4.00 $ 0.07 $ 0.26  
Vesting period 48 months              
Vesting percentage       25.00%        
Number of equal monthly installments | installment       36        
Grant date fair value | $       $ 1,063        
Blade Urban Air Mobility [Member] | Vesting on one year anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period       1 year        
Blade Urban Air Mobility [Member] | Vesting over the following three years                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period       3 years        
Blade Urban Air Mobility [Member] | Options granted on July 11, 2019 one                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of options granted | shares     25,000          
Exercise price | $ / shares     $ 0.48          
Term of option     10 years          
Number of equal monthly installments | installment     24          
Grant date fair value | $     $ 7          
Blade Urban Air Mobility [Member] | Options granted on July 11, 2019 two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of options granted | shares     891,500          
Exercise price | $ / shares     $ 0.48          
Term of option     10 years          
Vesting percentage     25.00%          
Number of equal monthly installments | installment     36          
Grant date fair value | $     $ 243          
Blade Urban Air Mobility [Member] | Options granted on July 11, 2019 two | Vesting on one year anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period     1 year          
Blade Urban Air Mobility [Member] | Options granted on July 11, 2019 two | Vesting over the following three years                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period     3 years          
Blade Urban Air Mobility [Member] | Options granted on July 11, 2019 three                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of options granted | shares     4,550          
Exercise price | $ / shares     $ 0.48          
Term of option     10 years          
Grant date fair value | $     $ 1          
Blade Urban Air Mobility [Member] | Options granted on July 28, 2019 one                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of options granted | shares   2,156,782            
Exercise price | $ / shares   $ 0.13            
Term of option   10 years            
Vesting percentage   25.00%            
Number of equal monthly installments | installment   36            
Grant date fair value | $   $ 153            
Blade Urban Air Mobility [Member] | Options granted on July 28, 2019 one | Vesting on one year anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period   1 year            
Blade Urban Air Mobility [Member] | Options granted on July 28, 2019 one | Vesting over the following three years                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period   3 years            
Blade Urban Air Mobility [Member] | Options granted on July 28, 2019 two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of options granted | shares   13,750            
Exercise price | $ / shares   $ 0.13            
Term of option   10 years            
Number of equal monthly installments | installment   24            
Grant date fair value | $   $ 1            
Blade Urban Air Mobility [Member] | Options granted on July 28, 2019 three                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of options granted | shares   30,000            
Exercise price | $ / shares   $ 0.13            
Term of option   10 years            
Grant date fair value | $   $ 2