Business Segments - Revenues generated following geographic regions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 3,010	$ 5,401	$ 9,754	$ 12,073
Operating Segments | United States
Segment Reporting Information [Line Items]
Total revenue	1,502	1,516	4,952	5,107
Operating Segments | United Kingdom
Segment Reporting Information [Line Items]
Total revenue	554	1,329	1,900	2,838
Operating Segments | Brazil
Segment Reporting Information [Line Items]
Total revenue	174	2,128	504	2,308
Operating Segments | Rest of World
Segment Reporting Information [Line Items]
Total revenue	$ 780	$ 428	$ 2,398	$ 1,820