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Merger Accounting - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Acquisition Date [Line Items] |
Goodwill | $ 27,407
Arsanis [Member] |
Acquisition Date [Line Items] |
Cash and 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 | 879
Current liabilities | (5,221)
Loans payable | (8,713)
Other liabilities, non-current | (1,515)
Goodwill | 27,407
Purchase price | $ 46,358

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