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Notes Payable - Interest expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Notes Payable    
Interest expense $ 862 $ 862
Total interest expense on Convertible Senior Notes 1,503 1,493
Notes Payable    
Notes Payable    
Interest expense 1  
Amortization of debt discount   11
Total interest expense on Convertible Senior Notes $ 1 $ 11