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

Related Party Transactions (Details)

v3.21.1
Related Party Transactions (Details) - Blade Urban Air Mobility [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jan. 20, 2021
Sep. 30, 2020
Feb. 25, 2020
Related Party Transaction [Line Items]              
Ownership Interest (Percentage)             10.00%
Blade UAM Foundation, Inc              
Related Party Transaction [Line Items]              
Amount due from related parties           $ 78  
Underhill              
Related Party Transaction [Line Items]              
Amount paid for for air charter services $ 312 $ 379 $ 939 $ 959      
Underhill | Melissa Tomkiel              
Related Party Transaction [Line Items]              
Ownership Interest (Percentage)         20.00% 20.00%  
Percentage of ownership interest transferred back to Underhill           50.00%