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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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Total fund of the Partnership which was contributed by limited partners.

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- Definition

The market value of investments in trading equity securities and other forms of trading securities that provide ownership interests.

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- Definition

The amount of investment in partnership.

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- Definition

The percentage ownership in Partnership's total subscribed capital.

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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

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- Definition

Amortized cost of investments in debt securities classified as trading.

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