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Equity - Substitute Warrants (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
May 24, 2021
USD ($)
May 23, 2021
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
Class of Stock [Line Items]          
Warrants, exercise price per share | $ / shares     $ 6.49 $ 9.09 $ 1.09
Unamortized compensation costs     $ 2,200    
General and administrative     27,308 $ 74,944  
Warrant liability     37 292  
Change in fair value of warrant liabilities     $ (255) $ (1,692)  
Merger agreement          
Class of Stock [Line Items]          
Exchange Ratio 3.16 4.96      
Substitute Warrants          
Class of Stock [Line Items]          
Warrants exercised | shares       4,909,066  
Warrants, exercise price per share | $ / shares       $ 2.45  
Change in fair value of warrant liabilities       $ 400  
Volatility rate     80.00%    
Risk-free rate, minimum     0.03%    
Risk-free rate, maximum     0.32%    
Substitute Warrants | Minimum          
Class of Stock [Line Items]          
Strike price | $ / shares     $ 1.53    
Expected term     6 months 25 days    
Substitute Warrants | Maximum          
Class of Stock [Line Items]          
Change in fair value of warrant liabilities     $ 100    
Strike price | $ / shares     $ 3.19    
Expected term     3 years 8 months 8 days    
Substitute Warrants | Merger agreement          
Class of Stock [Line Items]          
Warrant liability $ 53,300        
Reclassification of legacy NeuroRx warrants to warrant liability 38,200        
Change in fair value of warrant liabilities $ 15,100        
Legacy NeuroRx Warrants          
Class of Stock [Line Items]          
Volatility rate     80.00%    
Risk-free rate, maximum     0.32%    
Legacy NeuroRx Warrants | Minimum          
Class of Stock [Line Items]          
Strike price | $ / shares     $ 7.58    
Risk-free rate, minimum     0.03%    
Expected term     6 months 25 days    
Legacy NeuroRx Warrants | Maximum          
Class of Stock [Line Items]          
Strike price | $ / shares     $ 15.84    
Expected term     3 years 8 months 8 days