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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Summary of allocated expense
The following table summarizes ESPP expense incurred under the 2016 Employee Stock Purchase Plan and included in our accompanying unaudited interim condensed consolidated statements of operations:
(in thousands)Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Selling, general, and administrative$137 $70 $276 $143 
Cost of sales30 18 60 30 
Research and development12 12 23 19 
Total$179 $100 $359 $192 
The following table summarizes stock-based compensation expense incurred under the Amended 2022 Stock Plan and Inducement Grants included in the accompanying unaudited interim condensed consolidated statements of operations:
(in thousands)Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Selling, general, and administrative$7,069 $4,766 $13,301 $8,673 
Research and development334 213 606 413 
Cost of sales282 170 532 309 
Total$7,685 $5,149 $14,439 $9,395 
Summary of stock option and restricted stock activity
A summary of stock options (including Inducement Grants), RSA, and PSU activity under the Amended 2022 Stock Plan and Inducement Grants during the six months ended June 30, 2024 and 2023 is presented below:
(in thousands)OptionsPSUsRSAs
Outstanding at December 31, 2022907—1,141
Granted385624
Options Exercised/RSAs Vested(26)—(338)
(1)
Forfeited(24)—(46)
Outstanding at June 30, 2023860851,381
Outstanding at December 31, 2023689841,351
Granted—74606
Options Exercised/RSAs Vested(54)—(433)
(2)
Forfeited——(12)
Outstanding at June 30, 20246351581,512
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(1)Includes 99 thousand shares purchased from employees to cover employee income taxes related to income earned upon vesting of restricted stock. The shares purchased are held in treasury and the $4.1 million total purchase price for the shares is included in Treasury stock in our accompanying unaudited interim condensed consolidated balance sheets.
(2)Includes 149 thousand shares purchased from employees to cover employee income taxes related to income earned upon vesting of restricted stock. The shares purchased are held in treasury and the $10.0 million total purchase price for the shares is included in Treasury stock in our accompanying unaudited interim condensed consolidated balance sheets.