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Property and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property and Equipment | 7. Property and Equipment Property and equipment consisted of the following at December 31, 2020 and 2021 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | December 31,
​ |  | Lives in years |  | 2020 |  | 2021
Leasehold improvements | ​ | 2 to 15 | ​ | $ | 409 | ​ | $ | 6
Research and laboratory equipment |  | 3 to 5 | ​ |  | — | ​ |  | 65
Office equipment and furniture |  | 3 to 5 | ​ |  | 582 | ​ |  | 353
​ | ​ | ​ | ​ |  | 991 | ​ |  | 425
Less: accumulated depreciation and amortization |  |  | ​ |  | (886) | ​ |  | (361)
​ | ​ | ​ | ​ | $ | 106 | ​ | $ | 64
​ During each of the years ended December 31, 2020 and 2021, the Company wrote-off fully depreciated assets which were no longer in use and had no associated re-sale value other than scrap value. The significant reduction in leasehold improvements was a result of the lease assignment of the Company’s facility in Dundee, Scotland in May 2021 and involved the derecognition of $0.4 million of fully depreciated assets associated with the lease.

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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