Employee benefit plan	12 Months Ended
Employee benefit plan	Dec. 31, 2014
Employee benefit plan
Employee benefit plan	16. Employee benefit plan We have a defined contribution savings plan in accordance with Section 401(k) of the Internal Revenue Code. This plan covers substantially all employees who meet the IRS requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. Company contributions to the plan may be made at the discretion of the board of directors. Employer contributions of $393, $330 and $347 were made to the plan by us in 2014, 2013 and 2012, respectively.

The entire disclosure for pension and other postretirement benefits.