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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2017

Shareholders' Equity:

Schedule of Weighted Average Assumptions

The following weighted-average assumptions were used for grants issued during the three and six months ended June 30, 2017 and 2016 under the ASC No. 718 requirements.

		Three months ended June 30,								Six months ended June 30,
		2017				2016				2017				2016
Weighted average risk-free rate			1.61	%			1.16	%			1.62	%			1.20	%
Weighted average volatility			114.33	%			111.27	%			114.70	%			111.02	%
Dividend yield			0.00	%			0.00	%			0.00	%			0.00	%
Expected life			7.38 years				6.29 years				7.25 years				6.17 years

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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 stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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=96867065&loc=d3e5070-113901

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