Share-based Compensation

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

9. Share-based Compensation

Our Third Amended and Restated 2006 Stock Option and Incentive Plan allows for granting of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock units, unrestricted stock awards and deferred stock awards to our officers, employees, directors and consultants.

The components of share-based compensation expense were as follows:


	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(in thousands)				(in thousands)
Stock option awards	$	391	$	310	$	780	$	624
Restricted stock units		245		161		477		335

Total share-based compensation	$	636	$	471	$	1,257	$	959

Stock-based compensation is included in our statements of operations as follows:


	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(in thousands)				(in thousands)
Cost of sales	$	83	$	41	$	148	$	94
Sales and marketing		136		114		273		230
General and administrative		351		271		702		546
Research and development		66		45		134		89

Total stock-based compensation	$	636	$	471	$	1,257	$	959

We did not grant any options during the six months ended June 30, 2018. Option grants during the six months ended June 30, 2017 were not material. Awards of restricted stock during the six months ended June 30, 2018 were not material, and we did not issue awards of restricted stock during the six months ended June 30, 2017.

We issued approximately 92,000 and 318,000 shares of common stock following the exercise or vesting of underlying stock options or restricted stock units in the six months ended June 30, 2018 and 2017, respectively.