| 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 |
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| 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 |
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| 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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