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Related Party Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
SSCS Pte. Ltd          
Related Party Transactions          
Consulting services $ 69 $ 75 $ 206 $ 213  
Amount payable         $ 23
SSCS Pte. Ltd | General and administration expenses          
Related Party Transactions          
Consulting services 14 15 41 43  
SSCS Pte. Ltd | Exploration and Evaluation          
Related Party Transactions          
Consulting services 55 60 165 170  
Ocean Renaissance LLC          
Related Party Transactions          
Amount payable         $ 0
Ocean Renaissance LLC | General and administration expenses          
Related Party Transactions          
Consulting services   $ 93   $ 281  
Ocean Renaissance LLC | Exploration and evaluation activities          
Related Party Transactions          
Consulting services $ 94   $ 281