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BUSINESS ACQUISITION (Tables) | 12 Months Ended
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Dec. 31, 2020
Shanxi |
Business Acquisition [Line Items] |
Summary of results of operations attributable to the acquisitions included in the Company's consolidated statement of operations since the acquisition date | ​
​ | ​ | ​ | ​
​ |  | Year ended December 31, 2018
Revenues | ​ | $ | 20,135
Net gain | ​ | $ | 752
Acquisitions of after-sales service centers |
Business Acquisition [Line Items] |
Summary of results of operations attributable to the acquisitions included in the Company's consolidated statement of operations since the acquisition date | ​
​ | ​ | ​ | ​
​ | ​ | Year ended December 31, 2018
​ |  | Chongqing/
​ | ​ | Suzhou/ Jinan
​ | ​ | Zhoushuo
Revenues | ​ | $ | 341
Net loss | ​ | $ | 582

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