Preferred Stock Warrant Liability (Details 1) (Aldagen Inc [Member], Warrant [Member])	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Aldagen Inc [Member] \| Warrant [Member]
Dividend yield	0.00%	0.00%
Volatility	83.25%	83.90%
Risk-free interest rate	0.48%	1.15%
Remaining contractual term (in years)	3 years 3 months	2 years 11 months 19 days

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=7578670&loc=d3e19207-110258

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- Definition

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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- Definition

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

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- Definition

Weighted average expected volatility of stock price.

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