Stock Option Plans and Warrants to Purchase Common Stock (Details 1) (Stock Options [Member], USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Stock Options [Member]
Summary of options/warrants activity
Beginning Balance	2,051,511	1,457,724
Granted	637,495	791,100
Exercised	(36,672)	(103,439)
Forfeited	(164,055)	(93,874)
Ending Balance	2,488,279	2,051,511
Beginning Balance, weighted average options/warrants exercise price	$ 2.63	$ 3.19
Granted, weighted average options/warrants exercise price	$ 1.79	$ 1.35
Exercised, weighted average options/warrants exercise price	$ 0.77	$ 0.57
Forfeited, weighted average options exercise price	$ 3.13	$ 2.84
Ending Balance, weighted average options/warrants exercise price	$ 2.40	$ 2.63

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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)(3)

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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.

+ References

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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 that were terminated.

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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.

+ References

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

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