Fair Value Measurements (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Warrants [Member]
Change in Level 3 warrant liability [Roll Forward]
Percentage of increase in stock price (in hundredths)	141.00%
Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Cash equivalents	6,144,000	$ 8,144,000
Liabilities [Abstract]
Warrant liability	25,237,000	9,793,000
Change in Level 3 warrant liability [Roll Forward]
Beginning balance		9,793,000
Ending balance	25,237,000	9,793,000
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Assets [Abstract]
Cash equivalents	6,144,000	8,144,000
Liabilities [Abstract]
Warrant liability	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	0
Liabilities [Abstract]
Warrant liability	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	0
Liabilities [Abstract]
Warrant liability	25,237,000	9,793,000
Change in Level 3 warrant liability [Roll Forward]
Beginning balance		9,793,000
Ending balance	25,237,000	9,793,000
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Warrants [Member]
Liabilities [Abstract]
Warrant liability	25,237,000
Change in Level 3 warrant liability [Roll Forward]
Beginning balance	9,793,000
Change in fair value	15,444,000
Ending balance	25,237,000

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+ References

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

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.

+ 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 (c)

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

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

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