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Summary of Significant Accounting Policies - Revenue Recognition (Details)

v3.21.1
Summary of Significant Accounting Policies - Revenue Recognition (Details) - Blade Urban Air Mobility [Member] - USD ($)
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
Disaggregation of Revenue [Line Items]            
Deferred Revenue $ 4,415,000 $ 3,973,000 $ 4,415,000 $ 3,973,000 $ 3,973,000 $ 3,328,000
Revenues 9,273,000 6,454,000 17,259,000 11,677,000 23,434,000 31,196,000
Short distance            
Disaggregation of Revenue [Line Items]            
Revenues 1,049,000 1,787,000 3,179,000 5,138,000 9,941,000 26,017,000
Between 60 and 100 miles in distance            
Disaggregation of Revenue [Line Items]            
Monthly computer pass         295  
Between 60 and 100 miles in distance | Minimum            
Disaggregation of Revenue [Line Items]            
Servicing commuters per seat     595,000   595  
Between 60 and 100 miles in distance | Maximum            
Disaggregation of Revenue [Line Items]            
Servicing commuters per seat     795,000   795  
MediMobility organ transplant and jet            
Disaggregation of Revenue [Line Items]            
Revenues 7,729,000 4,588,000 13,253,000 6,453,000 12,785,000 4,965,000
Between New York and Manhattan            
Disaggregation of Revenue [Line Items]            
Annual Airport Pass     795,000   795  
Between New York and Manhattan | Minimum            
Disaggregation of Revenue [Line Items]            
Servicing commuters per seat     95,000      
Annual Airport Pass         95  
Between New York and Manhattan | Maximum            
Disaggregation of Revenue [Line Items]            
Servicing commuters per seat     295,000   195  
Other            
Disaggregation of Revenue [Line Items]            
Revenues $ 495,000 $ 79,000 $ 827,000 $ 86,000 $ 708,000 $ 214,000