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The Business - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 20 Months Ended
Jan. 31, 2018
patient
May 31, 2017
USD ($)
Oct. 31, 2016
patient
Mar. 31, 2016
cohort
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Feb. 28, 2017
USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items]                
Grants awarded           $ 8.6   $ 12.2
Funding of grant award   $ 5.7     $ 7.9      
Ischemic Repair (CD34 Cell Technology) [Member]                
Research and Development Arrangement, Contract to Perform for Others [Line Items]                
Grants awarded             $ 1.9  
The Sanford Project: T-Rex Study [Member]                
Research and Development Arrangement, Contract to Perform for Others [Line Items]                
Number of cohorts | cohort       2        
Number of patients enrolled | patient 110   19          
Interim efficacy analysis, threshold (percent)     50.00%          
Interim efficacy analysis, follow-up milestone period     6 months