401(k) Savings Plan

12 Months Ended

Dec. 31, 2016

Compensation And Retirement Disclosure [Abstract]

401(k) Savings Plan

13. 401(k) Savings plan

In 1997, the Company established a defined-contribution savings plan under Section 401(k) of the Internal Revenue Code (“the 401(k) Plan”). The 401(k) Plan covers all employees who meet defined minimum age and service requirements, and allows participants to defer a portion of their annual compensation on a pretax basis. The Company did not make any contributions to the 401(k) Plan through December 31, 2014. In February 2017 and 2016, the Company made contributions of approximately $1.0 million and $0.6 million, respectively, related to employee contributions made during 2016 and 2015, which is included in accrued expenses and other current liabilities as of December 31, 2016 and 2015.