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Shareholders' Equity - Equity Issuances (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 14, 2016
USD ($)
clinical_trial_subject
$ / shares
shares
Nov. 30, 2015
USD ($)
shares
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
shares
Dec. 31, 2016
shares
Class of Stock [Line Items]          
Common Stock Warrants, Shares | shares       218,978 388,062
Shares Issued, Price Per Share | $ / shares $ 4.72        
Common stock, shares issued | shares       9,427,001 8,205,791
RD Purchase Agreement [Member]          
Class of Stock [Line Items]          
Stock Issued During Period, Shares, New Issues | shares 847,458        
Proceeds from Issuance of Common Stock $ 4.0        
Private Purchase Agreement [Member]          
Class of Stock [Line Items]          
Proceeds from Issuance of Common Stock     $ 6.0    
Proceeds from Issuance of Common Stock, Second Closing, Receivable     $ 4.0    
Purchase Commitment, Maximum Amount Committed, Shares | shares 4,449,153        
Proceeds from Issuance of Common Stock, Initial Closing $ 12.6        
Proceeds from Issuance of Common Stock, Second Closing $ 8.4        
Number of Subjects, Phase 2 CLBS03 Clinical Trial, Second Closing | clinical_trial_subject 70        
Aspire Capital Purchase Agreement [Member]          
Class of Stock [Line Items]          
Proceeds from Issuance of Common Stock       $ 1.2  
Purchase Commitment, Maximum Amount Committed, Shares | shares   1,101,927.6      
Purchase Commitment, Remaining Minimum Amount Committed   $ 30.0      
Term of agreement in months   24 months      
Stock Issued During Period, Shares, Other | shares   84,269.6   210,506  
Shares, Issued | shares       319,776  
Common Stock, Value, Issued       $ 1.5  
Discount Applied To Weighted Average Price   5.00%