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Defined Contribution Plan	12 Months Ended
Defined Contribution Plan	Dec. 31, 2017
Defined Contribution Plan
Defined Contribution Plan	7. Defined Contribution Plan The Company maintains a defined contribution plan covering substantially all domestic employees. Participating employees may make contributions to the plan, through payroll deductions. Matching contributions are made by the Company equal to 50% of the employee’s contribution to the extent such employee contribution did not exceed 6% of their compensation. During the years ended December 31, 2017, 2016 and 2015, the Company expensed approximately $237 thousand, $211 thousand and $211 thousand, respectively, related to this plan.