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SIGNIFICANT RISKS AND UNCERTAINTIES (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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SIGNIFICANT RISKS AND UNCERTAINTIES |  |
Cash and cash equivalents denominated in foreign currency | $ 132 | $ 2,410

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- Definition The reporting currency-denominated asset value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration