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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Valuation Assumptions for Warrants) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
2011 [Member] |  |  |
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items] |  |  |
Volatility | [1] | 112.00% | 155.00%
Expected term (years) | [1] | 11 months 23 days | 1 year 11 months 23 days
Risk-free interest rate | [1] | 0.64% | 0.67%
Dividend yield | [1] | 0.00% | 0.00%
Exercise price | [1] | $ 23.00 | $ 23.00
Common stock closing price | [1] | $ 3.98 | $ 10.50
June 2013 [Member] |  |  |
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items] |  |  |
Volatility | [1] |  | 155.00%
Expected term (years) | [1] |  | 3 years 5 months 27 days
Risk-free interest rate | [1] |  | 1.23%
Dividend yield | [1] |  | 0.00%
Exercise price | [1] |  | $ 7.00
Common stock closing price | [1] |  | $ 10.50
July 2013 [Member] |  |  |
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items] |  |  |
Volatility | [1] |  | 155.00%
Expected term (years) | [1] |  | 3 years 6 months 15 days
Risk-free interest rate | [1] |  | 1.25%
Dividend yield | [1] |  | 0.00%
Exercise price | [1] |  | $ 7.00
Common stock closing price | [1] |  | $ 10.50
December 2013 [Member] |  |  |
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items] |  |  |
Volatility | [1] |  | 151.00%
Expected term (years) | [1] |  | 3 years 11 months 23 days
Risk-free interest rate | [1] |  | 1.37%
Dividend yield | [1] |  | 0.00%
Exercise price | [1] |  | $ 12.50
Common stock closing price | [1] |  | $ 10.50
[1] | See Note 11 - Warrants below for further description of the respective series of warrants.

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