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ORGANIZATION AND PRINCIPAL ACTIVITIES - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Short-term debt	$ 15,257	$ 16,630
Consolidated VIEs
Percentage of net revenue contributed by VIE	99.00%	99.40%	99.30%
Percentage of consolidated total assets contributed by VIE	90.30%	93.40%
Percentage of consolidated total liabilities contributed by VIE	82.70%	78.20%
Consolidated VIEs | WFOE
Short-term debt	$ 13,116	$ 14,630

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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