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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Valuation Assumptions for June 2016 Warrant Liability) (Details) - June 2016 Offering Warrants [Member] - $ / shares |  | 12 Months Ended
--- | --- | ---
Jun. 03, 2016 | Dec. 31, 2016
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items] |  |
Volatility | 123.00% | 118.00%
Expected term (years) | 5 years | 4 years 5 months 1 day
Risk-free interest rate | 1.23% | 1.80%
Dividend yield | 0.00% | 0.00%
Exercise price | $ 2.25 | $ 2.25
Common stock closing price | $ 2.06 | $ 0.44

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