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Organization and Principal Activities - reconciliation of cash, cash equivalents and restricted cash reported (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 34,122 $ 2,184    
Restricted cash 1,004    
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total $ 35,126 $ 2,184 $ 6,825 $ 4,338