Stock-Based Compensation (Details 3) (Warrant [Member], USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Warrant [Member]
Summary of all stock option plans / warrant activity
Number of Options/Warrants Outstanding, Beginning Balance	4,704,636
Warrants, Issued
Warrants, Expired/forfeited	(40,000)
Number of Options/Warrants Outstanding, Exercised	(590,094)
Number of Options/Warrants Outstanding, Ending Balance	4,074,542	4,704,636
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 1.61
Weighted Average Exercise Price, Issued
Weighted Average Exercise Price, Expired/forfeited	$ 1.00
Weighted Average Exercise Price, Exercised	$ 1.17
Weighted Average Exercise Price, Outstanding, Ending Balance	$ 1.69	$ 1.61
Weighted Average Remaining Contractual Life, Outstanding and exercisable	1 year 1 month 24 days	1 year 4 months 28 days
Weighted Average Remaining Contractual Life, Issued
Weighted Average Remaining Contractual Life, Expired/forfeited
Weighted Average Remaining Contractual Life, Exercised

Share based compensation weighted average remaining contractual life expired forfeited.

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Share based compensation weighted average remaining contractual life issued.

+ References

No definition available.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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- Definition

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

+ References

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- Definition

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

+ References

No definition available.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

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

+ References

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-Name Accounting Standards Codification

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

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-Name Regulation S-X (SX)

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