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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2015
Employee Benefit Plan
Employee Benefit Plan	16. Employee Benefit Plan The Company maintains a qualified defined-contribution plan under the provisions of the Internal Revenue Code Section 401(k), which covers substantially all employees in the United States who meet certain eligibility requirements. Under the plan, participants may defer their salary subject to statutory limitations and may direct the contributions among various investment accounts. The Company matches 100% of the participant’s first 3% of deferrals and 50% of the next 2% deferral percentage. The Company’s portion is 100% vested at the time of the match. The aggregate amounts charged to expense in connection with the plan were $1,049, $824 and $908 for the years ended December 31, 2015, 2014 and 2013, respectively.