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Employee Benefit Plan
12 Months Ended
Dec. 31, 2017
Defined Contribution Plan [Abstract]  
Compensation and Employee Benefit Plans, Other than Share-based Compensation [Text Block]

11. Employee Benefit Plan

The Company has a defined contribution plan under the Internal Revenue Code Section 401(k). This plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. For the years ended December 31, 2017 and 2016, the Company made a discretionary match of 50% up to the first 3% of employee contributions. All matching contributions have been paid by the Company. The Company’s matching contributions vest in full at the employee’s third anniversary of employment and all employer contributions thereafter vest immediately. The total Company matching contributions were  approximately $88,000 and $79,000 for the years ended December 31, 2017 and 2016, respectively. There were no Company matching contributions for the year ended December 31, 2015.