EMPLOYEE BENEFIT PLAN

12 Months Ended

Dec. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plan

12. EMPLOYEE BENEFIT PLAN

The Company maintains a qualified tax deferred defined contribution retirement plan (the “Plan”). Under the provisions of the Plan, substantially all employees meeting minimum age and service requirements are entitled to contribute on a before and after-tax basis a certain percentage of their compensation. The Company matched 100% of employees’ first 3% contribution and 50% of the employees’ next 2% contribution. Employees vest immediately in their contributions and the Company’s contribution. The Company’s contributions in 2017, 2016 and 2015 were $965, $892 and $794, respectively.