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Stockholders Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 09, 2022
Oct. 28, 2021
Jan. 26, 2021
Mar. 27, 2020
Feb. 12, 2020
Jan. 27, 2020
Dec. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]                
Common stock, shares authorized             217,000,000 217,000,000
Proceeds from issuance of private placement $ 45.0              
Warrant expiration term             5 years  
Common stock, par value (in dollars per share)   $ 0.01         $ 0.01 $ 0.01
Securities Purchase Agreement [Member]                
Class of Stock [Line Items]                
Proceeds from issuance of private placement       $ 25.0        
Shares Issued, Price Per Share   $ 3.30            
Proceeds from equity offerings, gross   $ 7.0            
Securities Purchase Agreement First Tranche [Member]                
Class of Stock [Line Items]                
Proceeds from issuance of private placement         $ 2.8      
Common stock issued in registered public financings (in shares)         993,139      
Securities Purchase Agreement Second Tranche [Member]                
Class of Stock [Line Items]                
Proceeds from issuance of private placement       $ 22.2        
Common stock issued in registered public financings (in shares)       7,717,661        
Common Stock [Member]                
Class of Stock [Line Items]                
Common stock issued in registered public financings (in shares)             8,275,060 8,710,800
Common Stock Subject to Mandatory Redemption [Member] | Securities Purchase Agreement [Member]                
Class of Stock [Line Items]                
Common stock issued in registered public financings (in shares)     6,153,847 8,710,800   8,710,800    
Shares Issued, Price Per Share     $ 3.25 $ 2.87   $ 2.87    
Exercise price of warrants     $ 3.25          
Warrants and Rights Subject to Mandatory Redemption [Member] | Securities Purchase Agreement [Member]                
Class of Stock [Line Items]                
Number of shares called by each warrant           1    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       8,710,800   8,710,800    
Exercise price of warrants           $ 2.87    
Warrants and Rights Subject to Mandatory Redemption [Member] | Securities Purchase Agreement [Member] | Maximum [Member]                
Class of Stock [Line Items]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     6,153,847          
Cystic Fibrosis Foundation [Member] | Securities Purchase Agreement [Member]                
Class of Stock [Line Items]                
Common stock issued in registered public financings (in shares)   909,091            
Innoviva Strategic Opportunities LLC [Member] | Securities Purchase Agreement [Member]                
Class of Stock [Line Items]                
Common stock issued in registered public financings (in shares) 9,000,000 1,212,122            
Shares Issued, Price Per Share $ 5.00              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 4,500,000              
Exercise price of warrants $ 5.00              
Innoviva Strategic Opportunities LLC [Member] | Securities Purchase Agreement First Tranche [Member]                
Class of Stock [Line Items]                
Common stock issued in registered public financings (in shares) 3,614,792              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,807,396              
Net proceeds from issuance of common stock and warrants $ 18.1              
Innoviva Strategic Opportunities LLC [Member] | Securities Purchase Agreement Second Tranche [Member]                
Class of Stock [Line Items]                
Common stock issued in registered public financings (in shares) 5,385,208              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 2,692,604              
Net proceeds from issuance of common stock and warrants $ 26.9