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Defined Contribution Plan	12 Months Ended
Defined Contribution Plan	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Defined Contribution Plan	(13) Defined Contribution Plan The Company makes available a 401(k) plan for its U.S. employees. Under the 401(k) plan, employees may make contributions which are eligible for a discretionary percentage match, in cash, as defined in the 401(k) plan and determined by the Board of Directors. The Company recognized 0.4 million and $0.5 million of related compensation expense for the year ended December 31, 2017 and 2016 respectively. The Company did not make any contributions in 2015.