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Material Accounting Policies - Going concern (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Material Accounting Policies    
Current assets $ 60,244 $ 243,033
Current liabilities 80,349 177,230
Working capital position (20,105)  
Unearned revenue $ 28,469 $ 30,991