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SHORT-TERM INVESTMENTS (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
SHORT-TERM INVESTMENTS    
Maturity Period of certificates of deposit, minimum 3 months 3 months
Maturity Period of certificates of deposit, maximum 1 year 1 year
Limit of certificates of deposit per banking institution | item 1 1
Number of investments exceeding FDIC limit | $ $ 0 $ 0