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401(k) savings plan | 12 Months Ended
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Dec. 31, 2016
401(k) savings plan [Abstract] |
401(k) savings plan | 13. 401(k) savings plan The Company has established a defined contribution savings plan under Section 401(k) of the Internal Revenue Code. The 401(k) Plan covers substantially all U.S. employees. Under the 401(k) Plan, employees may make elective salary deferrals. The Company currently provides for matching of qualified deferrals up to 50% of the first 6% of the employee's salary. During the years ended December 31, 2016, 2015, and 2014, the Company made matching contributions of approximately $2.5 million, $2.2 million and $2.1 million, respectively.

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