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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

Stockholders' Equity [Abstract]

Schedule of stock options outstanding and exercisable

						Weighted
						Average				Weighted								Weighted
						Remaining				Average								Average
Range of Exercise		Number				Contractual				Exercise				Options				Exercise
Prices between		Outstanding				Life				Price				Exercisable				Price
$0.32 - $0.65			3,443,680				9.37			$	0.41				1,288,537			$	0.49
$0.66 - $0.79			390,000				8.54				0.79				390,000			$	0.79
$0.80 - $12.25			370,897				6.19				5.51				370,897			$	5.51
			4,204,577				9.01			$	0.90

Summary of stock option activity

Balance, December 31, 2014			5,613,977
Granted			1,449,432
Forfeited or expired			(2,858,832	)
Balance, June 30, 2015			4,204,577

Schedule of weighted average assumptions

Risk-free interest rate		1.69%
Expected term		6.25 years
Expected price volatility		95.13%
Dividend yield		-

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- References

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (f)(2)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of the change in stock options.

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Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible).

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (e)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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