| Schedule of Intangible assets |
The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of June 30, 2024 were as follows (in thousands): | | | | | | | | | | | | | | Weighted Average | | Gross Carrying | | Accumulated | | | | | | Amortization Period | | Amount | | Amortization | | Total | Acquired technology | | 14 years | | $ | 102,822 | | $ | (23,818) | | $ | 79,004 | Dry stack electrolyzer technology | | 10 years | | | 29,000 | | | (6,767) | | | 22,233 | Customer relationships, trade name and other | | 13 years | | | 102,682 | | | (25,581) | | | 77,101 | | | | | $ | 234,504 | | $ | (56,166) | | $ | 178,338 |
The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of December 31, 2023 were 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 |
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| Schedule of future amortization of intangible assets |
The estimated amortization expense for subsequent years is as follows (in thousands): | | | | Remainder of 2024 | | $ | 9,380 | 2025 | | | 18,036 | 2026 | | | 16,462 | 2027 | | | 16,455 | 2028 | | | 16,046 | 2029 and thereafter | | | 101,959 | Total | | $ | 178,338 |
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