Convertible Preference Shares of Subsidiary (Details) - Series B CPS Fair values estimated based on the following assumptions	0 Months Ended	6 Months Ended	12 Months Ended
May 27, 2011	Dec. 07, 2010	Jun. 30, 2013 Series B CPS [Member] Convertible Preferred Stock [Member]	Jun. 30, 2012 Series B CPS [Member] Convertible Preferred Stock [Member]	Dec. 31, 2012 Series B CPS [Member] Convertible Preferred Stock [Member]	Dec. 31, 2011 Series B CPS [Member] Convertible Preferred Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Risk-free interest rate			0.11%	0.26%	0.16%	0.28%
Expected remaining term	3 years 6 months	5 years	222 days	1 year 149 days	1 year	1 year 295 days
Expected volatility			135.80%	106.00%	125.53%	81.69%
Dividend yield			0.00%	0.00%	0.00%	0.00%

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).

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

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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