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License Agreements (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 12, 2021
Apr. 30, 2020
Oct. 31, 2018
Oct. 31, 2017
Feb. 29, 2016
License Agreement 2014 | Maximum | Neos Therapeutics, Inc.          
Lump sum non-refundable license fee         $ 1.0
License Agreement 2017 | Maximum | Neos Therapeutics, Inc.          
Lump sum non-refundable license fee       $ 1.0  
License Agreement 2014 and 2017 | Neos Therapeutics, Inc.          
License agreement term   10 years      
License fee   $ 0.3      
Patent prosecution fees   0.1      
NeuRx License, Royalty Bearing License Agreement          
Payments for license agreement     $ 0.2    
Payments for contingent consideration on license agreement   $ 0.3      
Rumpus          
Contingent consideration $ 67.5        
Cash transferred 1.5        
Payment of aggregated fees 0.6        
In-process R&D | Rumpus          
Contingent consideration 67.5        
Cash transferred 1.5        
Payment of aggregated fees 0.6        
In-process R&D | Rumpus | Maximum          
Contingent consideration $ 67.5