v3.26.1
Share-based compensation expenses - Class C shares options granted by Ziitech to employees (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 01, 2024
shares
Jun. 28, 2019
installment
Jul. 31, 2018
shares
May 31, 2018
shares
Dec. 31, 2025
USD ($)
installment
$ / shares
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Share-based compensation expenses              
Granted (shares) | shares     740,000 16,042,500      
Annual vesting installments | installment   4     4    
Weighted average grant date fair value of options granted | $ / shares         $ 2.19    
Share-based compensation expenses | $         $ 14   $ (972)
Employee Stock Option Awards Of Ziitech Pty Ltd              
Share-based compensation expenses              
Unrecognized compensation cost | $         55    
Share-based compensation expenses | $         $ 14 $ 0 $ 0
Weighted average period         2 years 6 months    
Volatility rate         53.63%    
Dividend yield         0.00%    
Risk-free rate         4.38%    
Number Outstanding              
Acquisition of Ziitech (in shares) | shares         54,157    
Unvested at end of the year (in shares) | shares         54,157    
Weighted-Average Grant-Date Fair Value              
Acquisition of Ziitech (in dollars per share) | $ / shares         $ 2.19    
Unvested at end of the year (in dollars per share) | $ / shares         $ 2.19    
Ziitech Pty Ltd              
Share-based compensation expenses              
Granted (shares) | shares 89,442            
Total fair value of options granted | $         $ 0