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Loans payable (Tables)
 3 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Components of loans payable The following table shows the component of loans payable (in thousands):
March 31,December 31,
Effective Interest Rate20232022
(As Restated)(As Restated)
Loans payable, net, current:
TPC Loan, due 2023Interest free$399 $399 
Financing of directors and officers insurance, due 20234.24%585 1,449 
Other loans payable, current— 15 
Total loans payable, net, current$984 $1,863 
Loans payable, net, non-current:
SIF Loan1
$30,676 $30,434 
TPC Loan, due 2025Interest free737 734 
Total loans payable, net, non-current$31,413 $31,168 
1 Refer below for additional information on the repayment period and effective interest rate.