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Employee Benefit Plans
12 Months Ended
Dec. 31, 2019
Postemployment Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans We maintain defined contribution retirement plans for our employees. We established a 401(k) Plan for our U.S. employees and a defined benefit pension plan for our U.K. employees by which participants may defer taxation on a portion of their earnings, subject to a maximum amount under each applicable plan. We may make discretionary matching contributions to the plans on behalf of participants in any plan year. Any discretionary matching contributions made on behalf of participants become immediately vested and non-forfeitable to the participant. Total expense recognized by us for discretionary matching contributions made in 2019, 2018 and 2017 was $0.5 million, $0.2 million, and $0.2 million, respectively.