Stock-Based Compensation (Details 4) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of all stock option plans
Weighted Average Number of Shares/Warrants, Outstanding, Ending Balance	1,709,400
Warrant [Member]
Summary of all stock option plans
Weighted Average Number of Shares/Warrants, Outstanding, Beginning Balance	828,573	4,704,636	5,405,606
Warrants, Issued	2,575,000
Warrants, Expired/cancelled	(40,000)		(232)
Weighted Average Number of Shares, Exercised	(28,500)	(3,876,063)	(700,738)
Weighted Average Number of Shares/Warrants, Outstanding, Ending Balance	3,355,073	828,573	4,704,636
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 2.39	$ 1.61	$ 1.57
Weighted Average Exercise Price, Granted	$ 5.09
Weighted Average Exercise Price,Cancelled or expired	$ 3.98		$ 31.75
Weighted Average Exercise Price, Exercised	$ 2.85	$ 1.45	$ 1.18
Weighted Average Exercise Price, Outstanding, Ending Balance	$ 4.45	$ 2.39	$ 1.61
Weighted Average Remaining Contractual Life, Outstanding and exercisable	11 months 5 days	2 years 22 days	2 years 5 months 12 days

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.

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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

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

-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.

+ 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

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

+ 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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-Name Accounting Standards Codification

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-Subparagraph (c)(1)(i)-(ii)

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

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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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- Definition

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

+ References

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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

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