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License Agreements (Details) - USD ($)
$ in Millions
 1 Months Ended
Apr. 30, 2020
Oct. 31, 2017
Feb. 29, 2016
Cedars-Sinai Medical Center      
License agreement term 10 years    
License fee $ 0.3    
Patent prosecution fees $ 0.1    
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