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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
20242023
Selling, general, and administrative$139 $72 
Cost of sales30 12 
Research and development11 7 
Total$180 $91 
The following table summarizes stock-based compensation expense incurred under the 2022 Plan and Inducement Grants included in the accompanying unaudited interim condensed consolidated statements of operations:
(in thousands)Three Months Ended March 31,
20242023
Selling, general, and administrative$6,232 $3,908 
Research and development272 200 
Cost of sales250 139 
Total$6,754 $4,247 
Summary of stock option and restricted stock activity
A summary of stock option (including Inducement Grants), RSA, and PSU activity under the 2022 Plan and Inducement Grants during the three months ended March 31, 2024 and 2023 is presented below:
(in thousands)OptionsPSUsRSAs
Outstanding at December 31, 2022907—1,141
Granted385520
Options Exercised/RSAs Vested(5)—(235)
(1)
Forfeited(16)—(28)
Expired———
Outstanding at March 31, 2023889851,398
Outstanding at December 31, 2023689841,351
Granted—74542
Options Exercised/RSAs Vested(31)—(335)
(2)
Forfeited——(5)
Expired———
Outstanding at March 31, 20246581581,553
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(1)Includes 85 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 $3.5 million total purchase price for the shares is included in Treasury stock in our accompanying unaudited interim condensed consolidated balance sheets.
(2)Includes 129 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 $8.7 million total purchase price for the shares is included in Treasury stock in our accompanying unaudited interim condensed consolidated balance sheets.