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RETIREMENT SAVINGS PLANS	12 Months Ended
RETIREMENT SAVINGS PLANS	Dec. 31, 2017
RETIREMENT SAVINGS PLANS [Abstract]
RETIREMENT SAVINGS PLANS	11. RETIREMENT SAVINGS PLANS Substantially all of our employees in the United States are eligible to participate in a qualified defined contribution 401(k) plan. Participants may elect to have a specified portion of their salary contributed to the plan, and we may make discretionary contributions to the plan. ISS HK and ISS UK are obligated to contribute to certain employee pension plans. We made contributions totaling $81,000 and $92,000 to the plans for 2017 and 2016, respectively.