STOCKHOLDERS' EQUITY Share-Based Compensation (Notes)

6 Months Ended

Jun. 30, 2019

STOCKHOLDERS’ EQUITY

Stock-Based Compensation

Information with respect to option shares granted under all of our stock incentive plans for the six months ended June 30, 2019 was as follows:



	Time-Based Shares		Performance-Based Shares	Total Shares		Weighted- Average Exercise Price	Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Options outstanding at January 1, 2019	891,892		—	891,892		$8.46
Granted	—		—	—		$—
Exercised	(61,506	)	—	(61,506	)	$7.36
Forfeited or canceled	(231,886	)	—	(231,886	)	$10.96
Options outstanding at June 30, 2019	598,500		—	598,500		$7.61	1.64	$913
Options vested at June 30, 2019 or expected to vest				598,500		$7.61	1.64	$913
Options exercisable at June 30, 2019				598,500		$7.61	1.64	$913

Information with respect to our non-vested restricted stock units for the six months ended June 30, 2019 was as follows:



	Non-Vested Restricted Stock Units
	Time-Based Shares		Performance-Based Shares		Total Shares		Weighted- Average Grant-Date Fair Value	Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Non-vested at January 1, 2019	1,978,676		966,143		2,944,819		$4.91
Granted	1,158,983		411,043		1,570,026		$7.33
Vested	(578,326	)	(467,923	)	(1,046,249	)	$4.99
Forfeited	(106,053	)	(139,414	)	(245,467	)	$4.88
Non-vested at June 30, 2019	2,453,280		769,849		3,223,129		$6.06	1.26	$29,363
Expected to vest					3,024,601		$6.23	1.26	$27,554

Stock-based compensation was included in the following captions in our condensed consolidated statements of operations for the three and six months ended June 30, 2019 and 2018 (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Cost of products revenues	$	90	$	24	$	141	$	43
Cost of services revenues	77		50		95		84
Research and development expenses	262		51		457		203
Marketing and selling expenses	450		373		744		733
General and administrative expenses	1,126		1,054		2,306		1,192
	$	2,005	$	1,552	$	3,743	$	2,255