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STOCK-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2024
STOCK-BASED COMPENSATION  
Schedule of stock-based compensation expense

Total stock-based compensation expense was as follows (in thousands):

    

Three Months Ended

Six Months Ended

June 30, 

June 30, 

2024

2023

2024

2023

Cost of sales

$

5

$

5

$

9

$

9

Selling, general and administrative

 

298

 

339

628

659

Research and development

64

76

130

157

Total stock-based compensation expense

$

367

$

420

$

767

$

825