Warrant Liability (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
Jul. 31, 2008	Dec. 31, 2013	Dec. 31, 2012
Issuance of common stock, shares	6,686,650
Proceeds from direct offering	$ 17.5
Aggregate shares common stock callable by warrants	3,343,325
Exercise price of warrants	$ 3.62
Change in fair value of warrant liability		$ 0.3	$ 0.1

Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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-Publisher FASB

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-SubTopic 10

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-Subparagraph (SX 210.4-08.(i)(2))

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

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- Definition

Number of new stock issued during the period.

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Topic 505

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