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STOCK-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Share-Based Payment Arrangement, Restricted Stock Unit, Activity
A summary of RSU award activity during the nine months ended September 30, 2025 is as follows (in thousands except share and per share data):

Number of UnitsWeighted Average Grant-Date Fair Value
Outstanding RSU awards as of December 31, 2024— $— 
Granted1,121,175 11.56 
Vested— — 
Forfeited(399,475)10.56 
Outstanding RSU awards as of September 30, 2025721,700 $12.11 
Schedule of Option Activity
A summary of option activity during the nine months ended September 30, 2025 is as follows (in thousands except share and per share data):
NUMBER OF OPTIONS
WEIGHTED-AVERAGE EXERCISE PRICE
Outstanding as of December 31, 20245,384,760 $42.19 
Granted84,000 14.82 
Exercised(65,653)0.35 
Cancelled or Forfeited (766,443)54.60 
Expired(109,902)$47.75 
Outstanding as of September 30, 20254,526,762 $40.05 
Options exercisable as of September 30, 20253,541,878 $36.94 
Schedule of Stock-Based Compensation Expense
Total stock-based compensation expense recorded for employees, directors and non-employees during the three and nine months ended September 30, 2025 and 2024 was as follows (in thousands):
THREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
2025202420252024
Research and development$992 $4,699 $11,230 $13,225 
General and administrative2,994 4,118 10,161 12,447 
Total stock-based compensation expense$3,986 $8,817 $21,391 $25,672