Segment, Geographic Information and Revenue Disaggregation (Schedule of Segment Reporting) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Total revenues	$ 4,076	$ 2,860
Number of segments | segment	1
U.S.
Segment Reporting Information [Line Items]
Total revenues	$ 3,058	1,612
Germany
Segment Reporting Information [Line Items]
Total revenues	803	1,109
Other countries
Segment Reporting Information [Line Items]
Total revenues	$ 215	$ 139