Employee Benefits

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Employee Benefits

Employee Benefits

The Company has a 401(k) retirement plan (the “Vertex 401(k) Plan”) in which substantially all of its permanent U.S. employees are eligible to participate. Participants may contribute up to 60% of their annual compensation to the Vertex 401(k) Plan, subject to statutory limitations. The Company may declare discretionary matching contributions to the Vertex 401(k) Plan. Through mid-2013, the Company paid matching contributions in Vertex common stock in the form of fully-vested interests in a Vertex common stock fund. Beginning in mid-2013, the Company began paying matching contributions in the form of cash. For the years ended December 31, 2015, 2014 and 2013, the Company contributed approximately $12.8 million, $12.0 million and $12.6 million to the plan, respectively. As of December 31, 2015, 755,000 shares of common stock remained available for grant under the Vertex 401(k) Plan. In 2013, the Company declared matching contributions paid in fully-vested interests in the Vertex common stock fund to the Vertex 401(k) Plan as follows:

	2013
	(in thousands)
Discretionary matching contributions during the year ended December 31, 2013	$	5,930
Shares issued during the year ended December 31, 2013	99
Shares issuable as of the year ended December 31, 2013	—