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Defined Contribution Plan	12 Months Ended
Defined Contribution Plan	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Defined Contribution Plan	Defined Contribution Plan The Company sponsors a defined contribution plan under Section 401(k) of the Internal Revenue Code covering substantially all employees over the age of 18 years. Contributions made by the Company are voluntary and are determined annually by the Board of Directors on an individual basis subject to the maximum allowable amount under federal tax regulations. During the year ended December 31, 2017, the Company made contributions to the plan of approximately $0.2 million. The Company made no contributions for the years ended December 31, 2016 and 2015.