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Summary of Significant Accounting Policies - Changes in fair value of derivative liabilities (Details) - Derivative liability - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Changes in fair value of derivative liabilities    
Balance at the beginning of the period $ 5,739  
Balance at issuance   $ 3,820
Change in fair value 84 557
Derecognition upon conversion of convertible promissory note $ (5,823)  
Balance at the end of the period   $ 4,377