Common Stock, Redeemable Convertible Preferred Stock and Stockholders' Deficit (Details 8) (Aldagen Inc [Member], USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Aldagen Inc [Member]
Outstanding - Numberof Options	7,339,593	7,705,343
Outstanding - Weighted Average Remaining Contractual Life (inYears)	5 years 9 months 21 days	6 years 1 month 6 days
Outstanding - Weighted Average Exercise Price	$ 0.31	$ 0.33
Outstanding - Intrinsic Value	$ 147,092	$ 943,970
Exercisable - Numberof Options	6,173,109	5,482,037
Exercisable - Weighted Average Remaining Contractual Life (inYears)		5 years 9 months 18 days
Exercisable - Weighted Average Exercise Price	$ 0.3	$ 0.29
Exercisable - Intrinsic Value	$ 123,762	$ 458,573

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Weighted average remaining contractual term for fully vested and expected to vest options that are 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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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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