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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) (fuboTV Inc. Pre-Merger) (10-K) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Total financial liabilities |  | $ 3,574 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Total financial liabilities |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Total financial liabilities |  |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Total financial liabilities | $ 30,205 | 3,574 |  |  |
Fubo TV Pre-Merger [Member] |  |  |  |  |
Fair value of convertible note derivatives liability |  |  |  |  |
Total financial liabilities |  |  |  |  |
Fubo TV Pre-Merger [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair value of convertible note derivatives liability |  |  |  |  |
Total financial liabilities |  |  |  |  |
Fubo TV Pre-Merger [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair value of convertible note derivatives liability |  |  |  |  |
Total financial liabilities |  |  |  |  |
Fubo TV Pre-Merger [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair value of convertible note derivatives liability |  |  |  |  |
Total financial liabilities |  |  |  |  | $ 4,123

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