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The Business CLBS03 (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
cohort
May 04, 2017
USD ($)
Feb. 23, 2017
USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Interim Efficacy Analysis, Percentage Threshold 50.00%    
Interim Efficacy Analysis, Follow-up Milestone Period 6 years    
Grants Receivable     $ 12.2
The Sanford Project: T-Rex Study [Member]      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Number of Cohorts | cohort 2    
Subsequent Event [Member]      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Grants Receivable, Current   $ 5.7