Revenue - Disaggregated Revenue by Geography (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total Revenues	$ 11,847,000	$ 9,741,000	$ 24,638,000	$ 18,232,000
United States
Disaggregation of Revenue [Line Items]
Total Revenues	8,830,000	5,915,000	19,072,000	12,649,000
South America
Disaggregation of Revenue [Line Items]
Total Revenues	354,000	0	626,000	145,000
Europe
Disaggregation of Revenue [Line Items]
Total Revenues	1,562,000	1,143,000	3,028,000	1,981,000
Asia
Disaggregation of Revenue [Line Items]
Total Revenues	1,101,000	2,683,000	1,912,000	3,457,000
Total Foreign Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	$ 3,017,000	$ 3,826,000	$ 5,566,000	$ 5,583,000