Annual report pursuant to Section 13 and 15(d)

401(k) Plan

401(k) Plan
12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
401(k) Plan 401(k) PlanIn January 2005, we implemented a 401(k) Plan covering certain employees. Currently, all of our United States based employees over the age of 18 are eligible to participate in the 401(k) Plan. Under the 401(k) Plan, eligible employees may elect to reduce their current compensation up to a certain annual limit and contribute these amounts to the 401(k) Plan. We may make matching or other contributions to the 401(k) Plan on behalf of eligible employees. We recorded employer matching contributions expense of $0.7 million, $0.6 million, and $0.6 million in the years ended December 31, 2019, 2018, and 2017, respectively.