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Summary of Significant Accounting Policies (Concentration of Sales to Major Customers Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Customer Revenue Concentration
Revenue	$ 5,800,000	$ 13,500,000	$ 9,000,000
Concentration Risk, Percentage	53.00%	91.00%	98.00%
Secondary Customer Revenue Concentration
Revenue	$ 2,300,000
Concentration Risk, Percentage	21.00%
Third Customer Revenue Concentration
Revenue	$ 1,600,000
Concentration Risk, Percentage	14.00%
Accounts Receivable Concentration
Accounts receivable		$ 182,000
Concentration Risk, Percentage		74.00%
Second Accounts Receivable Concentration
Accounts receivable		$ 54,000
Concentration Risk, Percentage		22.00%

X

- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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