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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

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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