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Refers to number of common stock within each unit under securities purchase agreement.

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Refers to number of warrants within each unit under securities purchase agreement.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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

-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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Exercise price per share or per unit of warrants or rights outstanding.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

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-Paragraph 1

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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No definition available.

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Agreed upon price for the exchange of the underlying asset.

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-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

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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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Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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-Paragraph 29, 30, 31

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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Fair Value Measurements (Details) - USD ($)		1 Months Ended		9 Months Ended	12 Months Ended
Fair Value Measurements (Details) - USD ($)	May. 05, 2015	Oct. 31, 2014	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2015	Aug. 31, 2015	Aug. 27, 2015	May. 31, 2015	Dec. 31, 2014	Sep. 10, 2014	Jun. 04, 2014
Liabilities [Abstract]
Warrant liability				$ 9,793,000	$ 9,793,000	$ 12,527,000				$ 9,793,000
Warrant Liability [Abstract]
Warrant exercise price (in dollars per share)			$ 2.00								$ 1.00	$ 3.00
Period exercisable from the date of issuance		6 months	6 months 1 day
Change in Level 3 warrant liability [Roll Forward]
Beginning balance				9,793,000
Issuance of warrants				15,979,000
Exercised warrants				(8,257,000)
Change in fair value				(4,988,000)
Ending balance				12,527,000	9,793,000
Warrants [Member]
Liabilities [Abstract]
Warrant liability				10,000,000		10,000,000
Change in Level 3 warrant liability [Roll Forward]
Ending balance				10,000,000
October 2014 Warrants [Member]
Liabilities [Abstract]
Warrant liability				$ 4,400,000	$ 9,800,000	$ 4,400,000				$ 9,800,000
Warrant Liability [Abstract]
Warrant exercise price (in dollars per share)						$ 0.5771
Period exercisable from the date of issuance				6 months
Expiration term of warrant				5 years
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected term				4 years 6 months	5 years 3 months 18 days
Common stock market price (in dollars per share)						0.34				$ 0.49
Risk-free interest rate				1.37%	1.65%
Expected volatility					90.00%
Resulting fair value (in dollars per share)						$ 0.25				0.38
Change in Level 3 warrant liability [Roll Forward]
Beginning balance				$ 9,800,000
Ending balance				$ 4,400,000	$ 9,800,000
October 2014 Warrants [Member] \| Maximum [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected volatility				120.00%
October 2014 Warrants [Member] \| Minimum [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected volatility				90.00%
May 2015 Warrants [Member]
Liabilities [Abstract]
Warrant liability				$ 6,300,000		$ 6,300,000			$ 14,300,000
Warrant Liability [Abstract]
Warrant exercise price (in dollars per share)	$ 1.02					$ 1.02			$ 0.3263
Period exercisable from the date of issuance	6 months 1 day			6 months 1 day
Expiration term of warrant				5 years
Common stock issued, value				$ 25,000,000
Number of common stock within each unit (in shares)				1
Number of warrants within each unit (in shares)				1
Number of warrants to purchase common stock (in shares)						1
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected term				5 years 1 month 6 days	0 years
Common stock market price (in dollars per share)						$ 0.34				0
Risk-free interest rate				1.37%	0.00%
Expected volatility					0.00%
Resulting fair value (in dollars per share)						$ 0.25				0
Change in Level 3 warrant liability [Roll Forward]
Ending balance				$ 6,300,000
May 2015 Warrants [Member] \| Maximum [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected volatility				120.00%
May 2015 Warrants [Member] \| Minimum [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected volatility				90.00%
August 2015 Warrants [Member]
Liabilities [Abstract]
Warrant liability				$ 1,900,000		$ 1,900,000	$ 1,600,000
Warrant Liability [Abstract]
Warrant exercise price (in dollars per share)						$ 0.401		$ 0.407
Expiration term of warrant				5 years
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected term				4 years 10 months 28 days	0 years
Common stock market price (in dollars per share)						0.34				0
Risk-free interest rate				1.37%	0.00%
Expected volatility					0.00%
Resulting fair value (in dollars per share)						$ 0.25				$ 0
Change in Level 3 warrant liability [Roll Forward]
Ending balance				$ 1,900,000
August 2015 Warrants [Member] \| Maximum [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected volatility				120.00%
August 2015 Warrants [Member] \| Minimum [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected volatility				90.00%
Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Cash equivalents										$ 8,144,000
Liabilities [Abstract]
Warrant liability				$ 9,793,000	$ 9,793,000	$ 12,527,000				9,793,000
Change in Level 3 warrant liability [Roll Forward]
Beginning balance				9,793,000
Ending balance				12,527,000	9,793,000
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Assets [Abstract]
Cash equivalents										8,144,000
Liabilities [Abstract]
Warrant liability				0	0	0				0
Change in Level 3 warrant liability [Roll Forward]
Beginning balance				0
Ending balance				0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Assets [Abstract]
Cash equivalents										0
Liabilities [Abstract]
Warrant liability				0	0	0				0
Change in Level 3 warrant liability [Roll Forward]
Beginning balance				0
Ending balance				0	0
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Assets [Abstract]
Cash equivalents										0
Liabilities [Abstract]
Warrant liability				9,793,000	9,793,000	$ 12,527,000				$ 9,793,000
Change in Level 3 warrant liability [Roll Forward]
Beginning balance				9,793,000
Ending balance				$ 12,527,000	$ 9,793,000