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FAIR VALUE MEASUREMENTS - Reconciliation of the beginning and ending balances for contingent consideration measured at fair value on a recurring basis using significant unobservable (Details) - Contingent consideration $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the year	$ 105,670
Fair value change	(65,594)
Exchange difference	2,466
Contingent liability assumed by Renren	(42,542)
Balance at end of the year	$ 0

X

- Definition

Amount of gain (loss) on change in fair value liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

No definition available.

+ Details

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X

- Definition

Amount of gain (loss) on exchange differences on liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

No definition available.

+ Details

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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