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Stockholders' Equity (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Number of Shares
Beginning Balance	16,257,444	14,302,803		12,649,968
Granted	2,913,625	2,733,750	2,068,750
Exercised	(1,925,214)	0	(68,309)
Cancelled	(707,737)	(779,109)	(347,606)
Ending Balance	16,538,118	16,257,444	14,302,803	12,649,968
Weighted-Average Exercise Price
Beginning Balance	$ 1.28	$ 1.42		$ 1.49
Granted	$ 0.61	$ 0.58	$ 1.10
Exercised	$ 0.81	$ 0.00	$ 0.23
Cancelled	$ 1.30	$ 1.55	$ 2.25
Ending Balance	$ 1.21	$ 1.28	$ 1.42	$ 1.49

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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