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Merger Accounting - Summary of Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 13, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 27,109 $ 27,100 $ 0
Arsanis      
Business Acquisition [Line Items]      
Cash, cash equivalents and restricted cash $ 26,400 26,406  
Other current assets   2,147  
Property and equipment, net   68  
IPR&D indefinite-lived intangible assets   4,900  
Other assets, non-current   486  
Current liabilities   (5,205)  
Loans payable   (8,713)  
Other liabilities, non-current   (840)  
Goodwill   27,109  
Purchase price   $ 46,358