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Retirement Benefit Plans	12 Months Ended
Retirement Benefit Plans	Dec. 31, 2017
Retirement Benefits [Abstract]
Retirement Benefit Plans	Retirement Benefit Plans The Company has a defined contribution retirement plan that covers its eligible employees (the "Plan"). The Plan is qualified in accordance with section 401(k) of the Internal Revenue Code. Eligible employees can participate in the Company's pre-tax 401(k) plan or after-tax Roth 401(k) plan. As of February 2016, the Company makes matching contributions equal to 100% of the first 3% of compensation deferred by a participant. The Company may make a discretionary additional matching contribution. The Company recognized expense related to its contributions to the Plan of $1.3 million and $939,000 for the years ended December 31, 2017 and 2016, respectively.