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Property, Plant and Equipment, and Asset Impairment | 6 Months Ended
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Jun. 30, 2024
Property, Plant and Equipment, and Asset Impairment |
Property, Plant and Equipment, and Asset Impairment | Note 6 – Property, Plant and Equipment, and Asset Impairment At June 30, 2024, and December 31, 2023, property, plant and equipment consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Estimated Useful |  | June 30, |  | December 31,
($ in thousands) | ​ | Life (in years) | ​ | 2024 | ​ | 2023
Leasehold improvements |  | 9 | ​ |  | 7,694 | ​ |  | 7,694
Construction in process |  | N/A | ​ |  | — | ​ |  | 29
Total property, plant and equipment | ​ | ​ | ​ |  | 7,694 | ​ |  | 7,723
Less: impairment loss | ​ | ​ | ​ | ​ | (2,177) | ​ | ​ | —
Less: accumulated depreciation | ​ | ​ | ​ | ​ | (5,045) | ​ | ​ | (4,476)
Property, plant and equipment, net | ​ | ​ | ​ | $ | 472 | ​ | $ | 3,247
​ Depreciation expense for the three months ended June 30, 2024 and 2023, was approximately $0.3 million and $0.6 million, respectively, and was recorded in research and development expense in the Unaudited Statements of Operations. Depreciation expense for the six months ended June 30, 2024 and 2023, was approximately $0.6 million and $1.3 million, respectively, and was recorded in research and development expense in the Unaudited Statements of Operations. ​ Impairment of Long-Lived Assets ​ During the three months ended June 30, 2024, The Company concluded it had a triggering event requiring assessment of impairment for certain leasehold improvements and the related right-of-use asset. The Company assessed the carrying value of the asset group consisting of the leasehold improvements and right-of-use asset in accordance with ASC 360, given the significant changes to the Company’s operations, operating cash and the repurchase of equipment. The assessment of the recoverability of the asset group concluded that there was impairment on the carrying value of the asset group of approximately $2.6 million, which was allocated on a pro rata basis using the relative carrying amounts of the assets. Approximately $2.2 million of the impairment loss was allocated to the leasehold improvements, with the remaining $0.4 million allocated to the right-of-use asset.

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