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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

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

Schedule of weighted average assumptions

The weighted average assumptions used in the Black-Scholes model for employees and directors are presented below:

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Risk-free interest rate	1.00%		1.68%		0.99%		1.52%
Expected volatility	75%		110%		74%		111%
Expected life in years	5.0		5.1		5.0		5.1
Dividend yield	—		—		—		—
Forfeiture rate	7%		8%		8%		8%

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- References

No definition available.

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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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