Stock-Based Compensation (Stock Option Valuation Assumptions) (Details) - $ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Sep. 19, 2017
Common stock closing price	$ 1.01	$ 4.40	$ 0.99
Common Stock Options [Member]
Expected term (in years)		6 years
Expected dividend yield	0.00%	0.00%
Minimum [Member] \| Common Stock Options [Member]
Risk-free interest rate	1.27%	1.22%
Expected volatility	117.00%	113.00%
Expected term (in years)	2 years
Maximum [Member] \| Common Stock Options [Member]
Risk-free interest rate	2.36%	1.63%
Expected volatility	144.00%	123.00%
Expected term (in years)	9 years 1 month 6 days

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk-free interest rate assumption used in valuing an instrument.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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