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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2017
Empoyee Benefit Plan [Abstract]
Employee Benefit Plan	15. Employee Benefit Plan The Company offers employees the opportunity to participate in a 401(k) plan. Employer contributions are discretionary under the 401(k) plan. The Company did not match employee contributions made in 2016 or 2017.