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STOCK BASED COMPENSATION
 9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
STOCK BASED COMPENSATION STOCK BASED COMPENSATION
2018 Equity Incentive Plan
The amounts of stock based compensation expense recorded is as follows (in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2025202420252024
Cost of product revenue$37 $11 $67 $11 
Cost of service revenue38 30 119 90 
Research and development2,051 1,802 5,877 4,021 
General and administrative3,079 2,724 10,756 5,050 
Total stock based compensation$5,205 $4,567 $16,819 $9,172 
During the nine months ended September 30, 2025, the Company approved modifications to certain incentive stock option awards in connection with the termination of service of an employee. These modifications resulted in an extension of the post-termination exercise period for vested awards and a change of vesting conditions for unvested awards. As a result of these modifications, the Company recorded additional stock based compensation of $3,799 during the nine months ended September 30, 2025.
As of September 30, 2025 and December 31, 2024, the total number of shares of common stock that may be issued under the 2018 Plan was 25,084,129, of which 1,298,491 and 4,598,168, respectively, remained available for future grant.