Stock Option Plans and Warrants to Purchase Common Stock (Details 3) (Warrant [Member], USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Warrant [Member]
Summary of options/warrants activity
Beginning Balance	8,156,526	2,843,338
Granted	1,169,318	5,421,581
Exercised	(586,081)	(107,143)
Expired/Cancelled	(1,470,263)	(1,250)
Ending Balance	7,269,500	8,156,526
Beginning Balance, weighted average options/warrants exercise price	$ 2.17	$ 3.13
Granted, weighted average options/warrants exercise price	$ 1.48	$ 1.65
Exercised, weighted average options/warrants exercise price	$ 1.65	$ 1.65
Expired, weighted average warrant exercise price	$ 3.49	$ 15.00
Ending Balance, weighted average options/warrants exercise price	$ 1.15	$ 2.17

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(4)

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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