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Warrants (Details)
$ / shares in Units, shares in Millions, $ in Millions
2 Months Ended 3 Months Ended 12 Months Ended
Nov. 21, 2019
$ / shares
Nov. 05, 2019
$ / shares
shares
Dec. 31, 2019
USD ($)
measurementInput
$ / shares
shares
Dec. 31, 2019
USD ($)
measurementInput
$ / shares
shares
Dec. 31, 2019
USD ($)
measurementInput
$ / shares
shares
Nov. 04, 2019
$ / shares
shares
Oct. 04, 2019
Dec. 31, 2018
shares
Dec. 31, 2017
segment
Class of Warrant or Right [Line Items]                  
Pre-merger financing warrants, block provisions, exercise restriction percentage of common stock (in percentage)     4.99% 4.99% 4.99%        
Pre-merger financing warrants, block provisions, exercise restriction percentage of common stock (in percentage)     9.99% 9.99% 9.99%        
Percentage of amount on market value for failure to issue common stock on pre-merger financing warrants (in percentage)       2.00%          
Percentage of volume-weighted average trading price of a share of common stock that triggered release of converted additional shares (in percentage)             80.00%    
Number of former employees with warrants | segment                 2
Price Volatility                  
Class of Warrant or Right [Line Items]                  
Warrants fair value estimate volatility (in percentage) | measurementInput     0.960 0.960 0.960        
Series A Warrants                  
Class of Warrant or Right [Line Items]                  
Initial exercise price (in USD per share)     $ 7.13 $ 7.13 $ 7.13        
Warrants outstanding, term     60 months 60 months 60 months        
Proceeds From Warrant Exercises, Maximum Amount | $     $ 10.0            
Number of common shares in to which the warrants are exercisable (in shares) | shares     8.8 8.8 8.8        
Series B Warrants                  
Class of Warrant or Right [Line Items]                  
Initial exercise price (in USD per share)     $ 0.01 $ 0.01 $ 0.01        
Warrants outstanding (in shares) | $     $ 8.0 $ 8.0 $ 8.0        
Percentage of volume-weighted average trading price of a share of common stock that triggered release of converted additional shares (in percentage)     80.00% 80.00% 80.00%        
Price over which trading price of common stock as quoted on the Nasdaq Capital Market was considered for the release of converted additional shares (in USD per share) $ 1.00   $ 1.00   $ 1.00        
Common stock, issuable upon exercise of warrant (in shares) | shares     12.6 12.6 12.6        
Warrants, exercise price determination, number of trading days     10 days            
Warrants expiration, trading day       45 days 45 days        
Series C Warrants                  
Class of Warrant or Right [Line Items]                  
Initial exercise price (in USD per share)     $ 0.00 $ 0.00 $ 0.00 $ 7.13      
Price over which trading price of common stock as quoted on the Nasdaq Capital Market was considered for the release of converted additional shares (in USD per share)   $ 1.20              
Number of common shares in to which the warrants are exercisable (in shares) | shares     50.0 50.0 50.0        
Warrants, exercise price determination, number of trading days     5 days            
Warrants expiration, trading day         45 days        
Series C Warrants | Maximum                  
Class of Warrant or Right [Line Items]                  
Number of common shares in to which the warrants are exercisable (in shares) | shares   20.0       50.0      
Former Ocugen warrants                  
Class of Warrant or Right [Line Items]                  
Initial exercise price (in USD per share)     $ 5.67 $ 5.67 $ 5.67        
Warrants exercisable (in shares) | shares     0.9 0.9 0.9     0.9