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Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Apr. 30, 2019
Business Acquisition [Line Items]      
Goodwill $ 3,290 $ 3,290  
Bellweather Bio, Inc.      
Business Acquisition [Line Items]      
Cash     $ 521
Identified intangible assets     6,700
Goodwill     3,289
Net liabilities assumed     (1,802)
Total     $ 8,708