XML 33 R18.htm IDEA: XBRL DOCUMENT

Post-Employment Benefits	12 Months Ended
Post-Employment Benefits	Dec. 31, 2017
Postemployment Benefits [Abstract]
Post-Employment Benefits	10. Post-Employment Benefits We have a 401(k) Plan that covers substantially all of our employees in the U.S. Effective January 1, 2017, we have elected to match 100% of employees' contributions up to a maximum of 3% of an employee's annual salary. Matching contributions will be immediately vested. For the year ended December 31, 2017, we contributed approximately $3.5 million for the matching contributions. For the years ended December 31, 2016 and 2015, we did not provide a discretionary company match to employee contributions.