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Employee Benefit Plans	9 Months Ended
Employee Benefit Plans	Sep. 30, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company has a 401(k) defined contribution plan and, prior to January 1, 2018, provided for annual discretionary employer matching contributions not to exceed 3% of employees’ annual base salary per year. Effective January 1, 2018 the Company provides discretionary employer matching of 50% of employees’ eligible contributions. Matching contributions are fully vested and non-forfeitable at all times. The Company recorded expenses related to employer matching contributions of $0.7 million and $0.7 million for the three months ended September 30, 2018 and 2017, respectively, and $2.5 million and $1.5 million for the nine months ended September 30, 2018 and 2017, respectively.