Summary of Significant Accounting Policies - Advertising and Income Taxes (Details) - 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 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Unrecognized tax benefits | $ 0 | $ 0 | $ 0 | $ 0 | ||||
| Interest or penalties | 0 | 0 | $ 0 | $ 0 | ||||
| Blade Urban Air Mobility [Member] | ||||||||
| Advertising expense | $ 517,000 | $ 440,000 | $ 710,000 | $ 881,000 | $ 878,000 | $ 1,776,000 | ||
| Unrecognized tax benefits | 0 | 0 | ||||||
| Interest or penalties | $ 0 | $ 0 | ||||||
| X | ||||||||||
- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|