STOCKHOLDERS' EQUITY (Notes)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

STOCKHOLDERS’ EQUITY

Stock-Based Compensation

Information with respect to the Company’s option shares granted under all of our stock incentive plans for the nine months ended September 30, 2021 was as follows:


	Total Number of Options	Weighted- Average Exercise Price	Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Options outstanding at January 1, 2021	246,000	$7.48
Granted	—	—
Exercised	(246,000)	7.48
Forfeited or canceled	—	—
Options outstanding at September 30, 2021	—	—	—	—

Information with respect to the Company’s non-vested restricted stock units for the nine months ended September 30, 2021 was as follows:



	Number of Restricted Stock Units	Weighted- Average Grant-Date Fair Value	Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)	Shares Retained to Cover Statutory Minimum Withholding Taxes
Non-vested at January 1, 2021	2,114,879	$7.01			—
Granted	452,759	28.99			—
Vested	(1,269,341)	6.76			(414,070)
Forfeited	(41,123)	9.25			—
Outstanding at September 30, 2021	1,257,174	$15.09	0.92	$36,345

Information with respect to the Company’s non-vested performance-based restricted stock units for the nine months ended September 30, 2021 was as follows:



	Number of Performance-based Restricted Stock Units	Weighted- Average Grant-Date Fair Value	Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)	Shares Retained to Cover Statutory Minimum Withholding Taxes
Non-vested at January 1, 2021	653,428	$6.74			—
Granted	397,048	15.07			—
Vested	(471,112)	5.81			(196,703)
Forfeited	—	—			—
Non-vested at September 30, 2021	579,364	$13.20	1.04	$16,749

Stock-based compensation was included in the following captions in the Company’s condensed consolidated statements of operations for the three and nine months ended September 30, 2021 and 2020 (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Share-based compensation expense by type:

Time-based Restricted Stock Units	$	2,507	$	2,515	$	7,528	$	6,032
Performance-based Restricted Stock Units	977		756		2,599		2,021
ESPP	30		26		89		79
Total share-based compensation expense	$	3,514	$	3,297	$	10,216	$	8,132


	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Cost of products revenues	$	132	$	150	$	423	$	370
Cost of services revenues	311		283		938		539
Research and development expenses	340		546		1,270		1,199
Marketing and selling expenses	639		739		1,858		1,761
General and administrative expenses	2,092		1,579		5,727		4,263
Total share-based compensation expense	$	3,514	$	3,297	$	10,216	$	8,132