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Acquisitions - Goodwill (Details) - USD ($) $ in Thousands | Jun. 22, 2020 | Jun. 18, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Total goodwill recognized |  |  | $ 70,402 | $ 8,842
Giner ELX, Inc |  |  |  |
Consideration paid | $ 52,223 |  |  |
Less: net assets acquired | (26,930) |  |  |
Total goodwill recognized | $ 25,293 |  |  |
United Hydrogen Group Inc |  |  |  |
Consideration paid |  | $ 50,986 |  |
Less: net assets acquired |  | (14,603) |  |
Total goodwill recognized |  | $ 36,383 |  |

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