Revenue Recognition - Revenues Generated Following Geographic Regions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 4,238	$ 4,264	$ 8,930	$ 8,682
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	4,238	4,264	8,930	8,682
Operating Segments | United States
Disaggregation of Revenue [Line Items]
Total revenue	2,274	2,445	4,310	4,668
Operating Segments | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	385	774	762	1,453
Operating Segments | Germany
Disaggregation of Revenue [Line Items]
Total revenue	635	56	653	124
Operating Segments | Rest of World
Disaggregation of Revenue [Line Items]
Total revenue	$ 944	$ 989	$ 3,205	$ 2,437