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Employee Benefits	12 Months Ended
Employee Benefits	Dec. 31, 2018
Employee Benefits [Abstract]
Employee Benefits	17. Employee Benefits The Company has a qualified defined contribution plan that covers all U.S. employees under Section 401(k) of the Internal Revenue Code. Under this plan, the Company's stipulated basic contribution matches a portion of the participants' contributions based upon a defined schedule for GSE Performance Improvement Solutions employees. The Company's contributions to the plan were approximately $309,000 and $305,000 for the years ended December 31, 2018 and 2017, respectively.