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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

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,
	2013		2012		2013			2012
Risk-free interest rate	0.34%		0.32%		0.40%			0.37%
Expected volatility	108%		122%		112%			131%
Expected life in years	4		3.5		4			4
Dividend yield	—		—		—			—
Forfeiture rate	8%		8%		8%			8%

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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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