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
director
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
director
Sep. 30, 2019
USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Royalty earned   $ 19   $ 19    
Gross Revenue was up to $10,000            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Quarterly royalty payments, Percent 4.00%          
Gross Revenue in excess of $10,000 and up to $40,000            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Quarterly royalty payments, Percent 3.00%          
Gross Revenue exceeding $40,000            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Quarterly royalty payments, Percent 1.50%          
FlyBlade India attained a minimum profits of $3,500            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Interest in profit, percent 3.00%          
First Amended Joint Venture and License Agreements            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Royalty earned         $ 0  
First Amended Joint Venture and License Agreements | FlyBlade India            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Total number of director | director         5  
Due from joint venture         $ 73 $ 83
First Amended Joint Venture and License Agreements | Gross Revenue was up to $10,000            
Collaborative Arrangement and Arrangement Other than Collaborative [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            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Quarterly royalty payments, Percent 3.00%          
First Amended Joint Venture and License Agreements | Gross Revenue exceeding $40,000            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Quarterly royalty payments, Percent 1.50%          
First Amended Joint Venture and License Agreements | FlyBlade India attained a minimum profits of $3,500            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Interest in profit, percent 3.00%          
First Amended Joint Venture and License Agreements | Blade held at least a 10% interest            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Number Of Directors Appointed | director     3      
First Amended Joint Venture and License Agreements | Blade held at least a 10% interest | FlyBlade India            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Number Of Directors Appointed | director         3  
First Amended Joint Venture and License Agreements | Hunch            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Ownership interest 10.00%          
Investment in joint venture $ 200          
First Amended Joint Venture and License Agreements | FlyBlade India            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Ownership interest 90.00%          
Investment in joint venture $ 1,800