Stock-Based Compensation

9 Months Ended

Sep. 30, 2015

Stock-Based Compensation

Stock-Based Compensation

Note 4 - Stock-Based Compensation

The Company measures stock-based compensation expense at the grant date based on the fair value of the award and recognizes the compensation expense over the requisite service period, which is generally the vesting period.

The following table presents the classification of stock-based compensation expense recognized for the nine months ended September 30, 2015 and 2014:

	Nine months ended September 30,
(in thousands)	2015		2014
Selling, general and administrative expense	$	1,400	$	1,631
Research and development expense	694		557
Total stock-based compensation expense	$	2,094	$	2,188