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Employee Savings Plan	12 Months Ended
Employee Savings Plan	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Savings Plan	Employee Savings Plan The Company has a 401(k) savings plan that allows participating employees to contribute a portion of their salary, subject to annual limits and minimum qualifications. The Board may, at its sole discretion, approve Company matching contributions to the plan. The Company made contributions of $0.6 million, $0.6 million and $0.6 million for the years ended December 31, 2018, 2017 and 2016, respectively.