Stock-Based Compensation

6 Months Ended

Jun. 30, 2019

Note 5 - Stock-Based Compensation

Under the fair value recognition provisions of U.S. GAAP for accounting for 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 periods below:

	Three months ended June 30,				Six months ended June 30,
(in thousands)	2019		2018		2019		2018
Selling, general and administrative expense	$	309	$	555	$	635	$	1,006
Research and development expense		30		51		66		101
Total stock-based compensation expense	$	339	$	606	$	701	$	1,107