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Acquisition of Bellwether Bio - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Total $ 6,890 $ 7,800
Bellweather Bio, Inc.    
Business Acquisition [Line Items]    
2020 928  
2021 928  
2022 928  
2023 928  
2024 and thereafter 3,212  
Total $ 6,924