Warrants - Assumptions (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Fair value assumptions and methodology for assets and liabilities
Dividend yield	0.00%	0.00%
Minimum \| Black Scholes
Fair value assumptions and methodology for assets and liabilities
Expected volatility	91.00%	97.70%
Risk-free interest rate	1.86%	1.40%
Expected life in years	1 year 9 months 18 days	2 years 9 months 18 days
Minimum \| Monte Carlo Simulation Model
Fair value assumptions and methodology for assets and liabilities
Expected volatility	91.30%	97.70%
Risk-free interest rate	1.53%	1.03%
Expected life in years	6 months	1 year 6 months
Maximum \| Black Scholes
Fair value assumptions and methodology for assets and liabilities
Expected volatility	104.50%	106.40%
Risk-free interest rate	2.09%	1.92%
Expected life in years	4 years	5 years
Maximum \| Monte Carlo Simulation Model
Fair value assumptions and methodology for assets and liabilities
Expected volatility	95.70%	106.40%
Risk-free interest rate	1.87%	1.43%
Expected life in years	1 year 10 months 24 days	2 years 10 months 24 days

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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.

+ 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 (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

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

+ References

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- Definition

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

+ References

+ Details

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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