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Shareholders' Equity - Equity Issuances (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 22, 2017
USD ($)
shares
Sep. 14, 2016
USD ($)
clinical_trial_subject
$ / shares
shares
Nov. 30, 2015
USD ($)
shares
Mar. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2016
shares
May 31, 2015
shares
May 01, 2015
USD ($)
Class of Stock [Line Items]                
Common Stock Warrants, Shares | shares         285,462 388,062    
Shares Issued, Price Per Share | $ / shares   $ 4.72            
Common stock, shares issued | shares         8,912,602 8,205,791    
RD Purchase Agreement [Member]                
Class of Stock [Line Items]                
Stock Issued During Period, Shares, New Issues | shares 423,729 847,458            
Proceeds from Issuance of Common Stock $ 2.0 $ 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%          
Aspire Capital Purchase Agreement [Member]                
Class of Stock [Line Items]                
Purchase Commitment, Remaining Minimum Amount Committed               $ 30.0
Common stock, shares issued | shares             36,483.7