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Acquisition of Bellwether Bio - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Apr. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 3,290   $ 0
Bellweather Bio, Inc.      
Business Acquisition [Line Items]      
Cash   $ 521  
Identified intangible assets   6,700  
Goodwill $ 3,290 3,289  
Net liabilities assumed   (1,802)  
Total   $ 8,708