Segment, Geographic Information and Revenue Disaggregation (Schedule of Segment Reporting) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Segment Reporting Information [Line Items]
Total revenues	$ 5,031	$ 3,123	$ 9,107	$ 5,983
Number of segments | segment			1
U.S.
Segment Reporting Information [Line Items]
Total revenues	3,938	2,105	$ 6,996	3,717
Germany
Segment Reporting Information [Line Items]
Total revenues	1,008	799	1,811	1,907
Other countries
Segment Reporting Information [Line Items]
Total revenues	$ 85	$ 219	$ 300	$ 359