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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories and Property and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventories
Inventory write-down / (reversal when sold)	$ (458)	$ 2,456	$ 2,065
Furniture, fixtures and office equipment | Minimum
Property and equipment, net
Useful lives	2 months 12 days
Furniture, fixtures and office equipment | Maximum
Property and equipment, net
Useful lives	5 years
Software and IT equipment | Minimum
Property and equipment, net
Useful lives	1 month 6 days
Software and IT equipment | Maximum
Property and equipment, net
Useful lives	3 years
Vehicles | Minimum
Property and equipment, net
Useful lives	7 months 6 days
Vehicles | Maximum
Property and equipment, net
Useful lives	9 years

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- References

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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