STOCKHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Share-based Payment Arrangement, Option, Activity

Information with respect to the Company’s option shares granted under all of our stock incentive plans for the three months ended March 31, 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	(235,000)	$7.47
Forfeited or canceled	—	$—
Options outstanding at March 31, 2021	11,000	$7.70	0.38	$148

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity

Information with respect to the Company’s non-vested restricted stock units for the three months ended March 31, 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	201,259	21.80			—
Vested	(327,110)	6.17			(130,552)
Forfeited	(19,692)	7.37			—
Outstanding at March 31, 2021	1,969,336	$8.65	0.79	$41,553

Information with respect to the Company’s non-vested performance-based restricted stock units for the three months ended March 31, 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 March 31, 2021	579,364	$13.20	1.55	$12,225

Share-based Payment Arrangement, Expensed and Capitalized, Amount

Stock-based compensation was included in the following captions in the Company’s condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020 (in thousands):

	Three Months Ended March 31,
	2021		2020
Share-based compensation expense by type:
Time-based Restricted Stock Units	$	2,437	$	1,567
Performance-based Restricted Stock Units	$	656	$	516
ESPP	$	29	$	26
Total share-based compensation expense	$	3,122	$	2,109

	Three Months Ended March 31,
	2021		2020
Cost of products revenues	$	142	$	102
Cost of services revenues	298		98
Research and development expenses	521		294
Marketing and selling expenses	602		441
General and administrative expenses	1,559		1,174
Total share-based compensation expense	$	3,122	$	2,109