| Schedule of Intangible assets |
The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of June 30, 2023 were as follows (in thousands): | | | | | | | | | | | | | | Weighted Average | | Gross Carrying | | Accumulated | | | | | | Amortization Period | | Amount | | Amortization | | Total | Acquired technology | | 14 years | | $ | 104,406 | | | (16,675) | | $ | 87,731 | Dry stack electrolyzer technology | | 10 years | | | 29,000 | | | (3,867) | | | 25,133 | Customer relationships, trade name and other | | 13 years | | | 103,449 | | | (17,230) | | | 86,219 | | | | | $ | 236,855 | | $ | (37,772) | | $ | 199,083 |
The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of December 31, 2022 were 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 |
The estimated amortization expense for subsequent years is as follows (in thousands): | | | | Remainder of 2023 | | $ | 9,569 | 2024 | | | 19,076 | 2025 | | | 18,300 | 2026 | | | 16,707 | 2027 | | | 16,699 | 2028 and thereafter | | | 118,732 | Total | | $ | 199,083 |
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| Schedule of changes in the carrying amount of goodwill |
The change in the carrying amount of goodwill for the six months ended June 30, 2023 was as follows (in thousands): | | | | Beginning balance at December 31, 2022 | | $ | 248,607 | Foreign currency translation adjustment | | | 1,358 | Ending balance at June 30, 2023 | | $ | 249,965 |
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