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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories and Property and Equipment, net (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition 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 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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