Retirement plan	12 Months Ended
Dec. 31, 2016
Retirement plan
Retirement plan	14. Retirement plan All U.S. employees are eligible to participate in a 401(k) plan which covers U.S. employees meeting certain age requirements in accordance with section 401(k) of the Internal Revenue Code. Under the provisions of the 401(k) plan, the Company has the ability to make matching contributions equal to a percentage of the employee’s voluntary contribution, as well as a non‑elective contribution. From the inception of the 401(k) plan the Company has not made a contribution of any type.

Retirement plan

12 Months Ended

Dec. 31, 2016

14. Retirement plan

All U.S. employees are eligible to participate in a 401(k) plan which covers U.S. employees meeting certain age requirements in accordance with section 401(k) of the Internal Revenue Code. Under the provisions of the 401(k) plan, the Company has the ability to make matching contributions equal to a percentage of the employee’s voluntary contribution, as well as a non‑elective contribution. From the inception of the 401(k) plan the Company has not made a contribution of any type.