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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible assets (Details) | 12 Months Ended
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Dec. 31, 2017
Minimum | Software |
Intangible assets |
Estimated useful lives of intangible assets | 3 years
Minimum | License |
Intangible assets |
Estimated useful lives of intangible assets | 3 years
Minimum | Other intangible assets |
Intangible assets |
Estimated useful lives of intangible assets | 1 year
Maximum | Software |
Intangible assets |
Estimated useful lives of intangible assets | 6 years
Maximum | License |
Intangible assets |
Estimated useful lives of intangible assets | 20 years
Maximum | Other intangible assets |
Intangible assets |
Estimated useful lives of intangible assets | 30 years

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The useful lives used for intangible assets other than goodwill, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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