Significant Accounting Policies - Additional Information (Detail Textuals) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015 USD ($) SimulationPath	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) SimulationPath	Sep. 30, 2014 USD ($)
Accounting Policies [Abstract]
Increase (decrease) in fair value of common stock warrant liability	$ (0.5)	$ (6.8)	$ (6.7)	$ (8.2)
Reverse stock split			one-for-twenty
Number of Monte Carlo pricing model simulations used to value the warrants \| SimulationPath	10,000		10,000

Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 4

-Subparagraph (SAB TOPIC 4.C)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section C

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration