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SHORT-TERM INVESTMENTS (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
SHORT-TERM INVESTMENTS
Annual interest rate (as a percent)	1.10%
Minimum
SHORT-TERM INVESTMENTS
Annual interest rate (as a percent)		1.10%
Maximum
SHORT-TERM INVESTMENTS
Annual interest rate (as a percent)		1.20%

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- Definition

The annual interest rate on short-term investments, classified as cash equivalents.

+ References

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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

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