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Segment, Geographic Information and Revenue Disaggregation (Schedule of Segment Reporting) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Segment Reporting Information [Line Items]        
Total revenues $ 3,395 $ 997 $ 9,378 $ 3,965
Number of segments | segment     1  
U.S.        
Segment Reporting Information [Line Items]        
Total revenues 2,572 296 $ 6,289 902
Germany        
Segment Reporting Information [Line Items]        
Total revenues 682 579 2,589 2,657
Other countries        
Segment Reporting Information [Line Items]        
Total revenues $ 141 $ 122 $ 500 $ 406