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Strategic License Agreement (Details) - Tevard Biosciences (Tevard) - Strategic license agreement - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Oct. 31, 2019
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Upfront payment   $ 5.2
Promissory notes purchased   $ 5.0
Stated interest rate (percent)   3.50%
Research and development expense $ 0.8  
Option maintenance fees 1.5  
Maximum exposure to future loss $ 5.0