Stock-Based Compensation

9 Months Ended

Sep. 30, 2016

Share-based Compensation [Abstract]

Stock-Based Compensation

Stock-Based Compensation

We maintain stock incentive plans to attract and retain officers, directors and key employees.  Stock awards under these plans include both performance based and non-performance based stock incentives.  We granted stock options and other incentive awards to our employees and nonemployee directors to acquire 137,470 shares and 27,990 shares of our Class A common stock for the three months ended September 30, 2016 and 2015, respectively, and 722,350 shares and 911,970 shares of our Class A common stock for the nine months ended September 30, 2016 and 2015, respectively.

In 2015, we granted 100,000 restricted stock units (“RSUs”). The RSUs vested based on the attainment of certain quarterly company performance criteria for the second, third and fourth quarters of 2015.  In 2015, 66,666 of the RSUs vested and in February 2016 the remaining 33,334 RSUs vested.

Total non-cash, stock-based compensation expense for all of our employees is shown in the following table for the three and nine months ended September 30, 2016 and 2015 and was assigned to the same expense categories as the base compensation for such employees:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2016		2015		2016		2015
	(In thousands)
Research and development expenses	$	731	$	1,270	$	2,491	$	3,318
Selling, general and administrative expenses	2,894		4,646		9,462		12,886
Total stock-based compensation	$	3,625	$	5,916	$	11,953	$	16,204

As of September 30, 2016, total unrecognized stock-based compensation cost, net of estimated forfeitures, related to our unvested stock awards was $29.7 million.