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

Intangible Assets - Purchase of Customer List (Details)

v3.21.1
Intangible Assets - Purchase of Customer List (Details) - Blade Urban Air Mobility [Member] - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 16, 2020
Mar. 08, 2019
May 07, 2018
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]            
Cash consideration $ 503     $ 503   $ 250
Underhill            
Finite-Lived Intangible Assets [Line Items]            
Cash consideration   $ 250        
Useful life   5 years        
Customer list            
Finite-Lived Intangible Assets [Line Items]            
Useful life       5 years 5 years  
Customer list | Sound Aircraft Flight Enterprises, Inc            
Finite-Lived Intangible Assets [Line Items]            
Cash consideration     $ 175      
Estimate of future commission liability of $543, net of discount of $26     517      
Total value of customer list acquired     692      
Estimate of future commission liability     543   $ 0 73
Discount     $ 26      
Additional revenue     10.00%      
Discount rate     5.00%      
Commission paid         74 469
Customer list | Sound Aircraft Flight Enterprises, Inc | Interest Expenses            
Finite-Lived Intangible Assets [Line Items]            
Commission expense         $ 1 $ 15
Customer list | Underhill            
Finite-Lived Intangible Assets [Line Items]            
Cash consideration   $ 250        
Useful life   5 years