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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2023
Intangible Assets and Goodwill |
Schedule of Intangible assets | The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of December 31, 2023 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted Average | ​ | Gross Carrying | ​ | Accumulated | ​ | ​ | ​
​ | ​ | Amortization Period | ​ | Amount | ​ | Amortization | ​ | Total
Acquired technology |  | 14 years |  | $ | 103,060 | ​ | $ | (20,204) | ​ | $ | 82,856
Dry stack electrolyzer technology | ​ | 10 years | ​ | ​ | 29,000 | ​ | ​ | (5,317) | ​ | ​ | 23,683
Customer relationships, trade name and other | ​ | 13 years | ​ |  | 103,981 | ​ | ​ | (21,634) | ​ | ​ | 82,347
​ | ​ | ​ | ​ | $ | 236,041 | ​ | $ | (47,155) | ​ | $ | 188,886
​ The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of December 31, 2022 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted Average | ​ | Gross Carrying | ​ | Accumulated | ​ | ​ | ​
​ | ​ | Amortization Period | ​ | Amount | ​ | Amortization | ​ | Total
Acquired technology |  | 14 years | ​ | $ | 104,221 | ​ | $ | (12,754) | ​ | $ | 91,467
Dry stack electrolyzer technology | ​ | 10 years | ​ | ​ | 29,000 | ​ | ​ | (2,417) | ​ | ​ | 26,583
Customer relationships, trade name and other |  | 13 years | ​ |  | 102,521 | ​ | ​ | (12,846) | ​ |  | 89,675
​ | ​ | ​ | ​ | $ | 235,742 | ​ | $ | (28,017) | ​ | $ | 207,725
Schedule of future amortization of intangible assets | ​ Estimated amortization expense for subsequent years was as follows (in thousands): ​
​ | ​ | ​ | ​
2024 |  | $ | 18,955
2025 | ​ | ​ | 18,174
2026 | ​ | ​ | 16,564
2027 | ​ | ​ | 16,556
2028 | ​ | ​ | 47,901
2029 and thereafter | ​ | ​ | 70,736
Total | ​ | $ | 188,886
Schedule of changes in the carrying amount of goodwill | The change in the carrying amount of goodwill for the year ended December 31, 2023 was as follows (in thousands): ​
​ | ​ | ​
Beginning balance at December 31, 2022 | $ | 248,607
Impairment of goodwill | ​ | (249,480)
Foreign currency translation adjustment | ​ | 873
Ending balance at December 31, 2023 | $ | -

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