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Property and Equipment | 12 Months Ended
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Dec. 31, 2021
Property and Equipment |
Property and Equipment | 5. Property and Equipment Property and equipment consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2021 | ​ | 2020 |
​ | ​ | (in thousands) |
Computers, software and equipment |  | $ | 41,955 |  | $ | 31,229 | ​
Furniture and fixtures | ​ | ​ | 539 | ​ |  | 527 | ​
Leasehold and tenant improvements | ​ | ​ | 8,574 | ​ |  | 6,957 | ​
Total gross carrying amount | ​ | ​ | 51,068 | ​ |  | 38,713 | ​
Less accumulated depreciation and amortization | ​ |  | (22,828) | ​ |  | (17,031) | ​
Total property and equipment, net | ​ | $ | 28,240 | ​ | $ | 21,682 | ​
​ Depreciation expense related to property and equipment in 2021, 2020, and 2019 was $6.3 million, $4.7 million, and $3.4 million, 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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