v3.26.1
Strategic Alliance with Allseas Group S. A. and Affiliates - Development of Project Zero Offshore Nodule Collection System (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Strategic Alliance with Allseas and Affiliates    
Exploration and evaluation expenses $ 13,257 $ 9,515
Project Management Technology Services    
Strategic Alliance with Allseas and Affiliates    
Exploration and evaluation expenses $ 600 $ 2,300