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Organization and Significant Accounting Policies - Pulse Aerospace, LLC (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) segment | Feb. 19, 2021 | Apr. 30, 2020 USD ($) | Jun. 10, 2019
Number of reportable segments | segment | 2 |  |  |
Restricted cash | $ | $ 8,322,000 |  | $ 0 |
Pulse Aerospace, LLC |  |  |  |
Ownership interest acquired |  |  |  | 100.00%
Arcturus UAV Inc. |  |  |  |
Ownership interest acquired |  | 100.00% |  |

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