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4. STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Weighted-Average Assumptions of Stock Based Compensation

		Three months ended June 30,				Six months ended June 30,
		2015		2014		2015		2014
Weighted-average risk-free rate		1.19%		1.26%		1.18%		1.25%
Weighted-average volatility		83.01%		81.42%		82.40%		81.62%
Dividend yield		0.00%		0.00%		0.00%		0.00%
Expected life		4.20 years		4.89 years		4.29 years		4.75 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=6415400&loc=d3e5070-113901

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