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Merger Accounting - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 13, 2019
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 27,100 $ 27,109 $ 0
Arsanis      
Business Acquisition [Line Items]      
Cash, cash equivalents and restricted cash 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