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The Business (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Feb. 28, 2017
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Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Grants awarded |  | $ 12.2
CLBS16 Treatment Of CMD |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |
Grants awarded | $ 1.9 |

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