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REVENUE (Tables) | 9 Months Ended
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Sep. 30, 2017
REVENUE. |
Schedule of net revenue |
|  | Nine-month periods ended September 30, |
|  | 2016 |  | 2017 |
Service revenue |  |  | 703,284 |  |  | 1,098,197 |
Equipment sales |  |  | 41,007 |  |  | 12,493 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 744,291 |  |  | 1,110,690 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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