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Notes Payable - Interest expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Debt Instrument [Line Items]        
Interest expense $ 872 $ 853 $ 1,734 $ 1,715
Total interest expense 1,506 1,046 3,002 2,100
Notes Payable        
Debt Instrument [Line Items]        
Interest expense 2   2  
Amortization of debt discount 11 33 21 98
Total interest expense $ 13 $ 33 $ 23 $ 98