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Collaboration Agreements - VEGF Revenue Recognized (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
VEGF Exercise 2016      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Total collaboration revenue $ 14,253 $ 583 $ 0