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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2016
Employee Benefit Plan
Employee Benefit Plan	11. Employee Benefit Plan The Company has an employee benefit plan under Section 401(k) of the Internal Revenue Code. The plan allows employees to make contributions up to a specified percentage of their compensation. Under the plan, the Company matches a portion of the employees’ contributions up to a defined maximum. The Company is currently contributing up to 3% of employee base salary, by matching 50% of the first 6% of annual base salary contributed by each employee. Approximately $0.3 million, $0.2 million and $0.1 million of 401(k) benefits were charged to operating expenses during 2016, 2015 and 2014, respectively.