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Intangible Assets and Goodwill - Gross Carrying Amount (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |
Gross Carrying Amount | $ 43,587 | $ 8,564 |  |  |  |  |  |
Accumulated Amortization | (4,336) | (3,025) |  |  |  |  |  |
Total | 39,251 | 5,539 |  |  |  |  |  |
Goodwill | 72,387 | 8,842 | $ 71,822 | $ 70,262 | $ 8,673 | $ 8,606 | $ 8,961 | $ 8,886
Increase in goodwill |  | 62,600 |  |  |  |  |  |
Translation gain on goodwill |  | 900 |  |  |  |  |  |
Goodwill impairments | 0 | 0 |  |  |  |  |  |
EnergyOr |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |
Acquired |  | 1,500 |  |  |  |  |  |
Milestone payments |  | $ 3,000 |  |  |  |  |  |
American Fuel Cell LLC |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |
Milestone payments | 2,900 |  |  |  |  |  |  |
In process R&D |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |
Gross Carrying Amount | 29,000 |  |  |  |  |  |  |
Total | $ 29,000 |  |  |  |  |  |  |
Acquired technology |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |
Weighted Average Amortization Period | 10 years | 9 years |  |  |  |  |  |
Gross Carrying Amount | $ 13,697 | $ 8,244 |  |  |  |  |  |
Accumulated Amortization | (4,042) | (2,815) |  |  |  |  |  |
Total | $ 9,655 | $ 5,429 |  |  |  |  |  |
Customer relationships, Backlog & Trademark |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |
Weighted Average Amortization Period | 6 years |  |  |  |  |  |  |
Gross Carrying Amount | $ 890 |  |  |  |  |  |  |
Accumulated Amortization | (294) |  |  |  |  |  |  |
Total | $ 596 |  |  |  |  |  |  |
Trademark |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |
Weighted Average Amortization Period |  | 9 years |  |  |  |  |  |
Gross Carrying Amount |  | $ 320 |  |  |  |  |  |
Accumulated Amortization |  | (210) |  |  |  |  |  |
Total |  | $ 110 |  |  |  |  |  |

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