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Employee benefit plan	12 Months Ended
Employee benefit plan	Dec. 31, 2018
Employee benefit plan
Employee benefit plan	18. 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 contribute a portion of their annual compensation on a pre-tax basis. The Company's matching contributions are paid each pay period and employees are immediately vested in all of the Company’s matching contributions regardless of the employee’s length of service with the Company. Employer contributions of $1,154, $891 and $819 were made to the plan by us in 2018, 2017 and 2016, respectively.