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Employee 401(k) Benefit Plan	12 Months Ended
Employee 401(k) Benefit Plan	Dec. 31, 2014
Employee 401(k) Benefit Plan [Abstract]
Employee 401(k) Benefit Plan	7. Employee 401(k) Benefit Plan We have a defined-contribution savings plan under Section 401(k) of the Internal Revenue Code. The plan covers substantially all employees. Employees are eligible to participate in the plan the first day of the month after hire and may contribute up to the current statutory limits under Internal Revenue Service regulations. The 401(k) plan permits us to make additional matching contributions on behalf of all employees. Through December 31, 2014, we have not made any matching contributions to the 401(k) plan.