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Organization and Significant Accounting Policies - Restricted Cash (Details) - USD ($) | Feb. 26, 2020 | Feb. 20, 2020 | Jun. 10, 2019 | Jan. 25, 2020 | Apr. 30, 2019
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Restricted Cash [Abstract] |  |  |  |  |
Restricted Cash |  |  |  | $ 5,000,000 | $ 0
Pulse Aerospace, LLC |  |  |  |  |
Restricted Cash [Abstract] |  |  |  |  |
Each milestone achievement | $ 2,500,000 | $ 2,500,000 |  |  |
Cash | $ 2,500,000 | $ 2,500,000 | $ 18,677,000 |  |

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