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Strategic License Agreement (Details) - Tevard Biosciences (Tevard) - Strategic license agreement - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
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   $ 1.6    
Option maintenance fees   $ 1.5   $ 3.0  
Maximum exposure to future loss $ 5.0   $ 5.0