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TRADING SECURITIES (Details) $ in Thousands, ¥ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 18, 2020 CNY (¥) | Jun. 18, 2020 USD ($)
Trading securities listed in Shanghai Stock Exchange [Abstract] |  |  |  |  |
Cost |  | $ 14,912 | $ 15,020 |  |
Market value |  | $ 27,003 | $ 28,239 |  |
Unrealized loss on trading securities | $ (1,047) |  |  |  |
Qingdao LP [Member] |  |  |  |  |
Investments [Abstract] |  |  |  |  |
Total capital fund of limited partnership |  |  |  | ¥ 2,224 | $ 315,000
Investment in partnership |  |  |  | ¥ 100 | $ 14,200
Ownership percentage in partnership |  |  |  | 4.30% | 4.30%
SMIC [Member] | Minimum [Member] |  |  |  |  |
Investments [Abstract] |  |  |  |  |
Ownership percentage in partnership |  | 30.00% |  |  |

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- Definition Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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