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Fair Value Measurements - Pulse purchase agreement (Details) - Pulse Aerospace, LLC |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 26, 2020 USD ($) | Feb. 20, 2020 USD ($) | Jun. 10, 2019 USD ($) item | Jan. 25, 2020 item | Jan. 25, 2020 USD ($)
Fair Value Measurement |  |  |  |  |
Total cash consideration | $ 2,500,000 | $ 2,500,000 | $ 18,677,000 |  |
Each milestone achievement | $ 2,500,000 | $ 2,500,000 |  |  |
Number of research and development milestones | item |  |  | 2 | 1 |
Business acquisitions gain |  |  |  |  | $ 832,000
Maximum |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Total cash consideration |  |  |  |  | $ 5,000,000
Each milestone achievement |  |  | $ 2,500,000 |  |

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