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

Investment in Joint Venture (Details)

v3.21.1
Investment in Joint Venture (Details) - Blade Urban Air Mobility [Member]
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 25, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
director
Mar. 31, 2020
USD ($)
director
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]            
Amount invested $ 200   $ 200   $ 200 $ 200
Equity Method Investment, Ownership Percentage 10.00%          
Royalty revenue   $ 19   $ 19    
Gross Revenue was up to $10,000            
Schedule of Equity Method Investments [Line Items]            
Quarterly royalty payments, Percent 4.00%          
Gross Revenue in excess of $10,000 and up to $40,000            
Schedule of Equity Method Investments [Line Items]            
Quarterly royalty payments, Percent 3.00%          
Gross Revenue exceeding $40,000            
Schedule of Equity Method Investments [Line Items]            
Quarterly royalty payments, Percent 1.50%          
FlyBlade India attained a minimum profits of $3,500            
Schedule of Equity Method Investments [Line Items]            
Interest in profit, percent 3.00%          
FlyBlade India            
Schedule of Equity Method Investments [Line Items]            
Amount invested $ 1,800          
Equity Method Investment, Ownership Percentage 90.00%   10.00%      
Total number of director | director       5    
Due from joint venture   $ 100   $ 100 73  
First Amended Joint Venture and License Agreements            
Schedule of Equity Method Investments [Line Items]            
Royalty revenue         $ 0  
First Amended Joint Venture and License Agreements | Gross Revenue was up to $10,000            
Schedule of Equity Method Investments [Line Items]            
Quarterly royalty payments, Percent 4.00%          
First Amended Joint Venture and License Agreements | Gross Revenue in excess of $10,000 and up to $40,000            
Schedule of Equity Method Investments [Line Items]            
Quarterly royalty payments, Percent 3.00%          
First Amended Joint Venture and License Agreements | Gross Revenue exceeding $40,000            
Schedule of Equity Method Investments [Line Items]            
Quarterly royalty payments, Percent 1.50%          
First Amended Joint Venture and License Agreements | FlyBlade India attained a minimum profits of $3,500            
Schedule of Equity Method Investments [Line Items]            
Interest in profit, percent 3.00%          
First Amended Joint Venture and License Agreements | Blade held at least a 10% interest            
Schedule of Equity Method Investments [Line Items]            
Number Of Directors Appointed | director     3