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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue |
Revenue from the Rendering of Services | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2020 |  | 2019 |  | 2018
Service revenue: | ​ | ​ |  |  | ​ |  |  | ​ |
Commissions | ​ | $ | 452,882 | ​ | $ | 431,781 | ​ | $ | 420,160
Fees | ​ |  | 418,714 | ​ |  | 372,243 | ​ |  | 329,355
​ | ​ |  | 871,596 | ​ |  | 804,024 | ​ |  | 749,515
Inventory sales revenue | ​ |  | 505,664 | ​ |  | 514,617 | ​ |  | 420,511
​ | ​ | $ | 1,377,260 | ​ | $ | 1,318,641 | ​ | $ | 1,170,026

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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