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Defined Contribution Plan	12 Months Ended
Defined Contribution Plan	Dec. 31, 2017
Retirement Benefits [Abstract]
Defined Contribution Plan	Defined Contribution Plan The Company has a defined contribution plan (401k Plan) covering substantially all of the Company’s employees. The 401k Plan was established to provide retirement benefits for employees and is employee funded up to the elective annual deferral limits. Effective January 1, 2015, the 401k Plan was amended. As a result, all employees are eligible to participate with no minimum service requirement, and the Company made matching contributions of $0.7 million, $0.4 million and $0.2 million for the years December 31, 2017, 2016 and 2015, respectively.