Fair Value of Financial Assets and Liabilities - Derivative Instruments (Valuation Assumptions for Warrants) (Details) - $ / shares	6 Months Ended	12 Months Ended
Jun. 30, 2015	Dec. 31, 2014
2011 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility	96.00%	155.00%
Expected term (years)	1 year 5 months 23 days	1 year 11 months 23 days
Risk-free interest rate	0.45%	0.67%
Dividend yield	0.00%	0.00%
Exercise price	$ 23.00	$ 23.00
Common stock closing price	$ 9.35	$ 10.50
June 2013 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility		155.00%
Expected term (years)		3 years 5 months 27 days
Risk-free interest rate		1.23%
Dividend yield		0.00%
Exercise price		$ 7.00
Common stock closing price		$ 10.50
July 2013 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility		155.00%
Expected term (years)		3 years 6 months 15 days
Risk-free interest rate		1.25%
Dividend yield		0.00%
Exercise price		$ 7.00
Common stock closing price		$ 10.50
December 2013 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility		151.00%
Expected term (years)		3 years 11 months 23 days
Risk-free interest rate		1.37%
Dividend yield		0.00%
Exercise price		$ 12.50
Common stock closing price		$ 10.50
March 2015 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility	144.00%
Expected term (years)	4 years 8 months 19 days
Risk-free interest rate	1.55%
Dividend yield	0.00%
Exercise price	$ 10.750
Common stock closing price	$ 9.35

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- Definition

Agreed upon price for the exchange of the underlying asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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).

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- Definition

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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