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Property and equipment | 12 Months Ended
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Dec. 31, 2021
Property and equipment |
Property and equipment | 2. Property and equipment Property and equipment, which include amounts recorded under capital leases, are stated at cost less accumulated depreciation and amortization (in thousands), and consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2020
Equipment | ​ | $ | 12,834 | ​ | $ | 11,199
Computer software | ​ |  | 4,399 | ​ |  | 5,186
Furniture and equipment | ​ |  | 1,397 | ​ |  | 1,437
Leasehold improvements | ​ |  | 3,287 | ​ |  | 3,267
Total | ​ |  | 21,917 | ​ |  | 21,089
Less: accumulated depreciation and amortization | ​ |  | (18,970) | ​ |  | (19,237)
​ | ​ | $ | 2,947 | ​ | $ | 1,852
​ The estimated useful lives of the property and equipment range between two years and ten years. Depreciation and amortization expense of property and equipment were approximately $0.9 million for the years ended December 31, 2021 and 2020, 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://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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