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Fair Value Measurements - Pulse purchase agreement (Details) - Pulse Aerospace, LLC - USD ($) $ in Thousands |  | 6 Months Ended
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Jun. 10, 2019 | Oct. 26, 2019
Fair Value Measurement |  |
Cash | $ 18,677 |
Maximum |  |
Fair Value Measurement |  |
Cash |  | $ 5,000

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