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Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2015
Employee Benefit Plans |
Employee Benefit Plans | 12. Employee Benefit Plans ​ Pension Plan The Company operates a defined contribution group personal pension plan for all of its UK based employees. Company contributions to the plan totaled approximately $63,000 and $65,000 for the years ended December 31, 2014 and 2015, respectively. 401(k) Plan The 401(k) Plan provides for matching contributions by the Company in an amount equal to the lesser of 100% of the employee’s deferral or 6% of the U.S. employee’s qualifying compensation. The 401(k) Plan is intended to qualify under Section 401(k) of the Internal Revenue Code, so that contributions to the 401(k) Plan by employees or by the Company, and the investment earnings thereon, are not taxable to the employees until withdrawn. Company matching contributions are tax deductible by the Company when made. Company employees may elect to reduce their current compensation by up to the statutorily prescribed annual limit of  $18,000 if under 50 years old and $24,000 if over 50 years old and to have those funds contributed to the 401(k) Plan. The Company made contributions of approximately $46,000 and $47,000 to the 401(k) Plan for the years ended December 31, 2014 and 2015, respectively.

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