Revenue Recognition - Disaggregated Revenue by Geography (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total Revenues	$ 30,467	$ 56,535	$ 45,166
United States
Disaggregation of Revenue [Line Items]
Total Revenues	25,882	43,887	29,510
South America
Disaggregation of Revenue [Line Items]
Total Revenues	777	1,290	2,118
Europe
Disaggregation of Revenue [Line Items]
Total Revenues	2,322	6,260	6,206
Asia
Disaggregation of Revenue [Line Items]
Total Revenues	1,486	5,098	7,332
Foreign
Disaggregation of Revenue [Line Items]
Total Revenues	$ 4,585	$ 12,648	$ 15,656