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Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2023
Intangible Assets and Goodwill |
Intangible Assets and Goodwill | 10. Intangible Assets and Goodwill ​ 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
​ The change in the gross carrying amount of the acquired technology and customer relationships, trade name and other from the years ended December 31, 2022 to 2023 was primarily due to changes in foreign currency translation. ​ Amortization expense for acquired identifiable intangible assets for the years ended December 31, 2023, 2022 and 2021 was $19.1 million, $21.2 million and $2.5 million, respectively. ​ 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
​ 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 | $ | -
​ Based on the results of our annual review, the Company recognized an impairment charge of $249.5 million for the year ended December 31, 2023. The Company’s stock price declined below book value during the fourth quarter of 2023. Management believes the decline of the stock price was due primarily to missed projections and reduced liquidity. The Company’s analyses did not indicate impairment of goodwill for the years ended December 31, 2022 and 2021. Goodwill was $0 and $248.6 million as of December 31, 2023 and 2022 respectively. See Note 2, “Summary of Significant Accounting Policies”, for a full description of the Company’s goodwill accounting policy.

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