Stockholders' Equity (Details 1) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Summary of warrants outstanding
Number of Warrants (shares)	1,012,060	3,514,817
Common Stock Warrant Liability	$ 2,022,729us-gaap_WarrantsAndRightsOutstanding	$ 19,540,583us-gaap_WarrantsAndRightsOutstanding
March 2013 financing
Summary of warrants outstanding
Exercise Price ($ per share)	$ 3.17
Expiration Date	Sep. 12, 2018
Number of Warrants (shares)	284,091	755,681
Common Stock Warrant Liability	2,022,729	7,859,085
January 2011 financing
Summary of warrants outstanding
Exercise Price ($ per share)	$ 5.60
Expiration Date	Jan. 27, 2016
Number of Warrants (shares)	0	1,673,750
Common Stock Warrant Liability	0	11,381,498
July 2009 financing
Summary of warrants outstanding
Exercise Price ($ per share)	$ 13.52
Expiration Date	Jul. 01, 2014
Number of Warrants (shares)	0	83,334
Common Stock Warrant Liability	0	300,000
Warrants assumed in June 2009 Merger
Summary of warrants outstanding
Number of Warrants (shares)	727,969	1,002,052
Common Stock Warrant Liability	$ 0	$ 0
Minimum \| Warrants assumed in June 2009 Merger
Summary of warrants outstanding
Exercise Price ($ per share)	$ 4.08
Expiration Date	Aug. 01, 2015
Maximum \| Warrants assumed in June 2009 Merger
Summary of warrants outstanding
Exercise Price ($ per share)	$ 5.12
Expiration Date	Apr. 28, 2016

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+ References

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+ 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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