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

Summary of Significant Accounting Policies - Accounts receivable and Prepaid Expenses and Other Current Assets (Details)

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Summary of Significant Accounting Policies - Accounts receivable and Prepaid Expenses and Other Current Assets (Details) - Blade Urban Air Mobility [Member] - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2019
Public Utilities, Inventory [Line Items]      
Allowance for uncollectible accounts $ 0 $ 0 $ 0
Prepaid expenses and other current assets 2,114 1,011 665
Marketing supplies      
Public Utilities, Inventory [Line Items]      
Prepaid expenses and other current assets $ 641 $ 512 $ 380