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

The reporting currency-denominated asset value.

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

Name:	us-gaap_AssetReportingCurrencyDenominatedValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant