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Property and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property and Equipment | 8. Property and Equipment Property and equipment consist of the following:
|  | December 31,
|  | 2020 |  | 2019
Computer hardware |  | $ | 184,145 |  |  | $ | 214,880 |
Computer software |  | 52,135 |  |  | 64,509 |
Furniture and fixtures |  | 8,951 |  |  | 9,546 |
Leasehold improvements |  | 23,389 |  |  | 25,768 |
|  | 268,620 |  |  | 314,703 |
Less: Accumulated depreciation |  | (256,888) |  |  | (288,178) |
Total |  | $ | 11,732 |  |  | $ | 26,525 |
Depreciation expense was approximately $15.6 million, $43.5 million and $55.8 million for 2020, 2019, and 2018, respectively. Amortization of property and equipment recorded under capital leases are included in depreciation expense.

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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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