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Description of Business (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 20, 2020
USD ($)
contingent_value_right
$ / shares
shares
Dec. 31, 2020
USD ($)
day
$ / shares
shares
Jun. 19, 2020
USD ($)
Dec. 31, 2019
$ / shares
Business Acquisition [Line Items]        
Common stock, par value (in dollars per share) | $ / shares   $ 0.01   $ 0.01
Contingent consideration liabilities | $   $ 15,800    
Business combination, consideration transferred, equity interests issued (in shares)   26,844,877    
Business combination common stock under contingent value right (in shares)   86,630,633    
Shares available for future issuance (in shares)   4,211,290    
Progenics        
Business Acquisition [Line Items]        
Common stock, par value (in dollars per share) | $ / shares $ 0.0013      
Maximum        
Business Acquisition [Line Items]        
Number of working days | day   5    
Minimum        
Business Acquisition [Line Items]        
Number of working days | day   4    
Progenics        
Business Acquisition [Line Items]        
Common stock, par value (in dollars per share) | $ / shares $ 0.01      
Shares to be received from acquisition conversion (in shares) 0.31      
Number of CVRs | contingent_value_right 1      
Aggregate cash payments percentage 40.00%      
Contingent consideration liabilities | $     $ 3,700  
Percentage of total consideration 19.90%      
Business combination contingent value right of total consideration | $ $ 100,000      
Business combination, common stock per share exercise price not to exceeded (in dollars per share) | $ / shares $ 4.42      
Business combination stock options assumed in the money (in shares) 34,000      
Business combination stock options assumed out of the money (in shares) 6,507,342      
Progenics | Cash Payments, 2022        
Business Acquisition [Line Items]        
Contingent consideration liabilities | $ $ 100,000      
Progenics | Cash Payments, 2023        
Business Acquisition [Line Items]        
Contingent consideration liabilities | $ $ 150,000