Concentration of Sales to Major Customers) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Total revenue	$ 1,469	$ 1,851
Customer Revenue Concentration
Total revenue	$ 1,500	$ 1,600
Concentration Risk, Percentage	100.00%	88.00%
Second Commercial Customer
Total revenue		$ 200
Concentration Risk, Percentage		11.00%
Accounts Receivable Concentration
Accounts receivable	$ 552,000
Concentration Risk, Percentage	100.00%

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details