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Stockholders' Equity - Preferred Stock (Details) - USD ($)
 3 Months Ended 12 Months Ended
Nov. 28, 2017
Nov. 02, 2017
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 27, 2017
Preferred Stock [Abstract]            
Preferred stock, shares authorized (in shares)     5,000,000 5,000,000    
Preferred stock, par value (in dollars per share)     $ 0.001 $ 0.001    
Preferred stock, shares issued (in shares)     23,500 23,500    
Preferred stock, shares outstanding (in shares)     1,203 2,431    
Common stock issued (in shares) 10,000          
Common Stock [Member]            
Preferred Stock [Abstract]            
Number of shares callable by warrants (in shares)     1      
Warrant exercise price (in dollars per share) $ 0.3333          
Common stock issued (in shares) 10,000          
2017 Rights Offering [Member]            
Preferred Stock [Abstract]            
Charge on Non Transferable Subscription Rights   $ 0        
Number of shares callable by warrants (in shares)   10,000        
Warrant exercise price (in dollars per share)   $ 0.3333        
Period exercisable from the date of issuance     30 months      
Common stock issued (in shares) 10,000          
Gross proceeds from private placement of stock $ 8,800,000          
Redemption price of warrant prior to expiration     $ 0.01      
Common stock price per share for warrant redemption     $ 0.833      
Number of consecutive trading days for warrant redemption     10 days      
2017 Rights Offering [Member] | Warrant [Member]            
Preferred Stock [Abstract]            
Number of shares callable by warrants (in shares)   18        
2017 Rights Offering [Member] | Common Stock [Member]            
Preferred Stock [Abstract]            
Number of shares callable by warrants (in shares)   1        
Series A Convertible Preferred Stock [Member]            
Preferred Stock [Abstract]            
Preferred stock, shares issued (in shares)       13,500 13,500  
Convertible preferred stock       3.60% 3.60%  
Preferred stock, shares outstanding (in shares)       0 0  
Series B Convertible Preferred Stock [Member]            
Preferred Stock [Abstract]            
Preferred stock, shares authorized (in shares)           10,000
Preferred stock, par value (in dollars per share)           $ 0.001
Number of shares callable by warrants (in shares) 18,000,000          
Common stock issued (in shares) 30,000,000          
Percentage of preferred stock converted to common stock     88.00%      
Preferred stock, dividend payment terms     Holders of Series B Convertible Preferred Stock shall be entitled to receive dividends in the same form as dividends actually paid on shares of the Common Stock when, as and if such dividends are paid on shares of Common Stock.      
Preferred stock, voting rights     Series B Convertible Preferred Stock has no voting rights.      
Preferred stock, dividend preference     Upon Cytori’s liquidation, dissolution or winding-up, whether voluntary or involuntary, holders of Series B Convertible Preferred Stock will be entitled to receive out of Cytori’s assets, whether capital or surplus, an amount equal to the $1,000 stated value per share for each share of Series B Convertible Preferred Stock before any distribution or payment shall be made to the holders of any junior securities.      
Preferred stock, liquidation preference per share     $ 1,000      
Series B Convertible Preferred Stock [Member] | Dividend Paid [Member]            
Preferred Stock [Abstract]            
Dividends payable       $ 4,000,000    
Series B Convertible Preferred Stock [Member] | 2017 Rights Offering [Member]            
Preferred Stock [Abstract]            
Number of shares callable by warrants (in shares)   10,000