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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 We have a defined contribution plan that covers employees meeting eligibility requirements. We match 100% of the first 3% of compensation that an employee elects to defer plus 50% of compensation that an employee elects to defer exceeding 3% but not exceeding 5%, subject to a maximum of $8,000. The Company’s matching contribution vests immediately. The Company's contributions were $0.3 million, $0.4 million and $0.3 million for the years ended December 31, 2017, 2016 and 2015, respectively.