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

Summary of Significant Accounting Policies - Commission Liability Rollforward (Details)

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Summary of Significant Accounting Policies - Commission Liability Rollforward (Details) - Blade Urban Air Mobility [Member] - Commission Liability [Member ] - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Commission Liability [Roll Forward]    
Fair Value Of Liability, Beginning Balance $ 73 $ 527
Payments (74) (469)
Accretion $ 1 15
Fair Value Of Liability, Ending Balance   $ 73