v3.20.4

Property and equipment | 12 Months Ended
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Dec. 31, 2020
Property and equipment |
Property and equipment | 8. Property and equipment The following is a summary of property and equipment, at cost less accumulated depreciation and amortization: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Leasehold improvements | ​ | $ | 596,242 | ​ | $ | 550,427
Construction in progress | ​ |  | 118,055 | ​ |  | 78,343
Software | ​ |  | 65,532 | ​ |  | 60,814
Computer equipment | ​ |  | 14,808 | ​ |  | 16,707
Furniture, fixtures and office equipment | ​ |  | 2,506 | ​ |  | 2,140
Total property and equipment | ​ |  | 797,143 | ​ |  | 708,431
Less: accumulated depreciation and amortization | ​ |  | (390,815) | ​ |  | (328,188)
Total property and equipment, net | ​ | $ | 406,328 | ​ | $ | 380,243
​ Depreciation and amortization expense, which includes depreciation and amortization for property and equipment under finance leases, for the years ended December 31, 2020, 2019, and 2018 amounted to $78,313, $70,862, and $78,837, respectively. During the years ended December 31, 2020, 2019, and 2018, we recognized $23, $370, and $148, respectively, of impairment losses primarily related to construction in progress projects that were abandoned. During the years ended December 31, 2020 and 2018, we also recognized $39 and $90, respectively, of losses on disposals of property and equipment.

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