Summary of Significant Accounting Policies (Details 2) (USD $)	3 Months Ended	12 Months Ended	142 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Aldagen Inc [Member]	Dec. 31, 2010 Aldagen Inc [Member]	Dec. 31, 2011 Aldagen Inc [Member]
Research and Development Expense	$ 901,685	$ 357,308	$ 3,386,439	$ 98,148	$ 3,989,081	$ 5,857,615	$ 43,125,085
Selling, general, and administrative					129,752	234,690	1,081,521
Total share-based compensation					$ 159,765	$ 298,853	$ 1,464,157

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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