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Right-of-Use Asset and Operating Lease Liability - Lease cost and other information (Details)

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Right-of-Use Asset and Operating Lease Liability - Lease cost and other information (Details) - Blade Urban Air Mobility [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Lease cost            
Short-term lease cost $ 12 $ 8 $ 52 $ 30 $ 60 $ 340
Operating lease cost 115 138 227 182 421 109
Total $ 127 $ 146 $ 279 $ 212 $ 481 $ 449
Weighted-average discount rate - operating lease 5.00%   5.00%   5.00%  
Weighted-average remaining lease term - operating lease (in months) 16 months   16 months   21 months