v3.26.1
STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2026
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-Based Payment Arrangement, Restricted Stock Unit, Activity
A summary of RSU award activity during the six months ended June 30, 2026 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, 2025716,850 $12.37 
Granted216,365 14.69 
Vested(201,178)11.70 
Forfeited(11,672)13.33 
Outstanding RSU awards as of June 30, 2026720,365 $13.23 
Schedule of Option Activity
A summary of option activity during the six months ended June 30, 2026 is as follows (in thousands except share and per share data):
NUMBER OF OPTIONS
WEIGHTED-AVERAGE EXERCISE PRICE
Outstanding as of December 31, 20253,901,706 $38.52 
Granted870,503 15.21 
Exercised(82,304)0.36 
Cancelled or Forfeited (75,625)58.15 
Expired(154,144)$39.51 
Outstanding as of June 30, 20264,460,136 $34.30 
Options exercisable as of June 30, 20263,127,451 $36.62 
Schedule of Stock-Based Compensation Expense
Total stock-based compensation expense recorded for employees, directors and non-employees during the three and six months ended June 30, 2026 and 2025 was as follows (in thousands):
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
2026202520262025
Research and development$2,480 $4,973 $4,767 $10,238 
General and administrative2,897 3,569 6,809 7,167 
Total stock-based compensation expense$5,377 $8,542 $11,576 $17,405