Employee Benefit Plan

12 Months Ended

Dec. 31, 2017

Postemployment Benefits [Abstract]

Employee Benefit Plan

11. Employee Benefit Plan

The Company maintains a 401(k) profit sharing plan (the “Plan”) for its employees. Each employee may elect to contribute a portion of his or her annual compensation to the Plan, subject to annual limits established by the Internal Revenue Service. For the years ended December 31, 2017, 2016 and 2015, the Company matched 50% of eligible contributions up to 6% of employee contributions. For the years ended December 31, 2017, 2016 and 2015 the Company contributed $0.9 million, $0.4 million and $0.2 million, respectively.