Warrants (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class of Warrant or Right [Line Items]
Calculated aggregate value	$ 11,286	$ 15,216
Warrant Liability
Class of Warrant or Right [Line Items]
Calculated aggregate value	$ 11,281	$ 15,216	$ 14,515
Weighted average exercise price per share of warrant	$ 7.08	$ 7.08	$ 7.04
Closing price per share of common stock	$ 2.59	$ 4.06	$ 3.75
Volatility	68.00%	70.00%	65.00%
Weighted average remaining expected life (years)	2 years 7 months	3 years 6 months	4 years 6 months
Risk-free interest rate	0.86%	1.20%	0.60%
Dividend yield	0.00%	0.00%	0.00%

Closing price per share of common stock.

No definition available.

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- Definition

It represents the expected term of warrants.

+ References

No definition available.

+ Details

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- Definition

It represents aggregate fair value of warrants.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Exercise price of the warrants.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column A

+ Details

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- Details

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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

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- Details

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