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EMPLOYEE RETIREMENT PLAN	12 Months Ended
EMPLOYEE RETIREMENT PLAN	Dec. 31, 2017
Retirement Benefits [Abstract]
EMPLOYEE RETIREMENT PLAN	EMPLOYEE RETIREMENT PLAN We sponsor a defined contribution retirement savings plan that qualifies under Section 401(k) of the Internal Revenue Code. Plan participants may elect to have a portion of their pre-tax compensation contributed to the plan, subject to certain guidelines issued by the Internal Revenue Service. Employer contributions are discretionary and were $0.4 million for the year ended December 31, 2017 and $0.8 million for the years ended December 31, 2016 and 2015.