Employee Benefit Plan

12 Months Ended

Dec. 31, 2016

Employee Benefit Plan

Employee Benefit Plan

16. Employee Benefit Plan

The Company maintains a defined contribution retirement plan available to all eligible U.S. employees pursuant to Section 401(k) of the U.S. Internal Revenue Code (the “401(k) Plan”).  Pursuant to the Company’s 401(k) Plan, participating U.S. employees may defer a portion of their pre-tax earnings, subject to annual IRS contribution limits. The Company began a discretionary contribution matching of employee’s contributions in February 2014. The Company matched 50% of each participant’s eligible contributions, up to a maximum employer matching contribution of 3% of each participant’s eligible base salary. Participants will vest in such discretionary employer matching contributions over a three-year graded vesting period.

Total employer matching contributions to the Company’s 401(k) Plan for the year ended December 31, 2016, 2015 and 2014 were $558, $745, and $461, respectively.