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Property and Equipment, net | 12 Months Ended
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Dec. 31, 2024
Property and Equipment, net |
Property and Equipment, net | 7. Property and Equipment, net Property and equipment, net consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023
Computer and office equipment | ​ | $ | — | ​ | $ | 239
Furniture and fixtures | ​ |  | — | ​ |  | 596
Leasehold improvements | ​ |  | — | ​ |  | 4,154
​ | ​ | $ | — | ​ | $ | 4,989
Less accumulated depreciation and amortization | ​ |  | — | ​ |  | (1,667)
Property and equipment, net | ​ | $ | — | ​ | $ | 3,322
​ On September 26, 2024, the Company entered into the Assignment Agreements in which its leasehold improvements and other property and equipment from its corporate office were transferred to a third party on November 1, 2024, with a carrying value of $3,417. As a result, there was no gain or loss on the sale of those assets (see Note 19, Commitments and Contingencies – Assignment of New Lease). There were no other gains or losses on sales of property and equipment during the years ended December 31, 2024, 2023 and 2022. Depreciation and amortization expense included in R&D expense and G&A expense was $192, $259 and $248 for the years ended December 31, 2024, 2023 and 2022, respectively.

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