v3.21.1

Property and equipment | 3 Months Ended
--- | ---
Mar. 31, 2021
Property and equipment |
Property and equipment | 6. Property and equipment The following is a summary of property and equipment, at cost less accumulated depreciation and amortization: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Leasehold improvements | ​ | $ | 626,712 | ​ | $ | 596,242
Construction in progress | ​ |  | 105,226 | ​ |  | 118,055
Software | ​ |  | 65,948 | ​ |  | 65,532
Computer equipment | ​ |  | 14,755 | ​ |  | 14,808
Furniture, fixtures and office equipment | ​ |  | 2,040 | ​ |  | 2,506
Total property and equipment | ​ |  | 814,681 | ​ |  | 797,143
Less: accumulated depreciation and amortization | ​ |  | (409,998) | ​ |  | (390,815)
Total property and equipment, net | ​ | $ | 404,683 | ​ | $ | 406,328
​ Depreciation and amortization expense, which includes depreciation and amortization for property and equipment under finance leases, for the three months ended March 31, 2021 and 2020 amounted to $20,745 and $18,646, respectively.

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration