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Employee Benefit Plans
12 Months Ended
Dec. 31, 2016
Compensation Related Costs [Abstract]  
Employee Benefit Plans
Employee Benefit Plans

401(k) Plan

In January 1999, we adopted a defined contribution retirement plan under Section 401(k) of the Internal Revenue Code for our U.S. employees. This plan covers substantially all U.S. employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. In 2009, our Board of Directors authorized us to match 50% of our employee’s salary deferral contributions up to a 6% of the employee’s eligible compensation effective 2010. We contributed approximately $3.4 million, $2.7 million and $2.2 million to the 401(k) plan during the year ended December 31, 2016, 2015 and 2014, respectively.

Israeli Funds

Under the Israeli severance fund law, we are required to make payments to dismissed employees and employees leaving employment in certain circumstances. The funding is calculated based on the salary of the employee multiplied by the number of years of employment as of the applicable balance sheet date. Our Israeli employees are entitled to one month’s salary for each year of employment, or a pro-rata portion thereof.  We fund the liability through monthly deposits into funds, and the values of these contributions are recorded in other current assets.

As of December 31, 2016 and 2015, the accrued funds liability was approximately $3.1 million and $2.7 million, respectively.