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LONG-TERM INVESTMENT (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | Sep. 05, 2019 shares | Sep. 30, 2019 USD ($) | Sep. 30, 2019 CNY (¥) | Jun. 27, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 11, 2017 USD ($) $ / shares shares
--- | --- | --- | --- | --- | --- | ---
Investments [Abstract] |  |  |  |  |  |
Investment in partnership |  | $ 4,200 | ¥ 30,000 |  |  |
Ownership percentage in partnership |  | 10.00% | 10.00% |  |  |
Classification of Investments [Abstract] |  |  |  |  |  |
Investment - equity method |  | $ 1,620 |  |  | $ 1,360 |
Investment - cost method |  | 4,348 |  |  | 0 |
Total |  | $ 5,968 |  |  | $ 1,360 |
Ninebell [Member] |  |  |  |  |  |
Investments [Abstract] |  |  |  |  |  |
Percentage of ordinary shares issued |  |  |  |  |  | 20.00%
Purchase price |  |  |  |  |  | $ 1,200
Ninebell [Member] | Class A Common Stock [Member] |  |  |  |  |  |
Investments [Abstract] |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 1,000
Shares issued (in shares) | shares |  |  |  |  |  | 133,334
Share price (in dollars per share) | $ / shares |  |  |  |  |  | $ 7.50
Shengyi [Member] |  |  |  |  |  |
Investments [Abstract] |  |  |  |  |  |
Percentage of ordinary shares issued |  |  |  | 15.00% |  |
Classification of Investments [Abstract] |  |  |  |  |  |
Number of investors with agreements entered | shares | 6 |  |  |  |  |
Investment - cost method |  |  |  | $ 109 |  |

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