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Segment, Geographic information and revenue disaggregation (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2023
USD ($)
segment
Mar. 31, 2022
USD ($)
Segment Reporting Information [Line Items]    
Total revenues $ 7,979 $ 4,076
Number of segments | segment 1  
U.S.    
Segment Reporting Information [Line Items]    
Total revenues $ 6,942 3,058
Germany    
Segment Reporting Information [Line Items]    
Total revenues 891 803
Other countries    
Segment Reporting Information [Line Items]    
Total revenues $ 146 $ 215