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ORGANIZATION AND PRINCIPAL ACTIVITIES - VIE Arrangements and Loan Agreement (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Jul. 31, 2019 USD ($)	Dec. 31, 2011 CNY (¥)	Dec. 31, 2011 USD ($)	Dec. 31, 2019
Details of History of the Group
Term of debt instrument				2 years
Qianghai Xuyi
Details of History of the Group
Term of debt instrument				10 years
Lanting Huitong | Mr. Quji (Alan) Guo
Details of History of the Group
Ownership interest in VIE (as a percent)		51.00%	51.00%
Related party loan		¥ 255,000,000	$ 41
Lanting Huitong | Mr. Jian He [Member]
Details of History of the Group
Ownership interest in VIE (as a percent)	51.00%
Related party loan	$ 40,492	¥ 255,000
Lanting Gaochuang | Mr. Quji (Alan) Guo
Details of History of the Group
Ownership interest in VIE (as a percent)		51.00%	51.00%
Lanting Gaochuang | Mr. Jian He [Member]
Details of History of the Group
Ownership interest in VIE (as a percent)	51.00%
Lanting Gaochuang | Lanting Huitong
Details of History of the Group
Ownership interest in VIE (as a percent)	49.00%	49.00%	49.00%
Shenzhen Xuyi | Qianneng Fu
Details of History of the Group
Ownership interest in VIE (as a percent)				67.00%
Shenzhen Xuyi | Zicong ke
Details of History of the Group
Ownership interest in VIE (as a percent)				33.00%

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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-Name Accounting Standards Codification
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