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Employee benefit plan	12 Months Ended
Employee benefit plan	Dec. 31, 2015
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 $511, $393 and $330 were made to the plan by us in 2015, 2014 and 2013, respectively. In December 2015, we made a change to our Plan Administrator.