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Shareholders’ equity (Tables)
 6 Months Ended
Jun. 30, 2025
Stockholders' Equity Note [Abstract]  
Schedule of stock based compensation expense
The table below summarizes information about the Company’s stock-based compensation for the three and six months ended June 30, 2025 and 2024 and the expense recognized in the condensed consolidated statements of operations:
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
(in thousands, except share and per share data)
Stock options
Options granted during period762,400 424,200 4,706,122 4,163,000 
Weighted average exercise price$3.34 $3.27 $3.32 $2.49 
Restricted stock units (RSUs)
Restricted stock units granted during period— — 901,900 1,316,200 
Grant date fair value$— $— $3.29 $2.40 
Stock compensation expense
Research and development$374 $1,119 $929 $2,160 
General and administrative390 2,061 1,128 3,034 
Total stock compensation expense$764 $3,180 $2,057 $5,194