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PROPERTY AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2023
PROPERTY AND EQUIPMENT, NET [Abstract] |
PROPERTY AND EQUIPMENT, NET | 3. PROPERTY AND EQUIPMENT, NET A summary of property and equipment at December 31, 2023 and 2022 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Furniture and fixtures and leasehold improvements | ​ | $ | 24 | ​ | $ | 24
Laboratory equipment | ​ |  | 965 | ​ |  | 931
Computer equipment and laboratory software | ​ |  | 1,097 | ​ |  | 990
Construction in process | ​ |  | 30 | ​ |  | 34
​ | ​ |  | 2,116 | ​ |  | 1,979
Less—accumulated depreciation and amortization | ​ |  | (1,377) | ​ |  | (1,102)
Total | ​ | $ | 739 | ​ | $ | 877
​ Depreciation expense was approximately $0.3 million and $0.3 million for the years ended December 31, 2023 and 2022, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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