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Merger Accounting (Tables) | 3 Months Ended
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Mar. 31, 2019
Business Combinations [Abstract] |
Schedule of Business Acquisitions by Acquisition, Contingent Consideration | The following summarizes the preliminary estimate of the purchase price paid in the Merger:
Number of shares of the combined organization owned by Arsanis stockholders (1) |  |  | 2,440,582 |
Multiplied by the fair value per share of Arsanis common stock (2) |  | $ | 18.66 |
Fair value of consideration issued it effect the Merger |  | $ | 45,541 |
Fair value of replacement awards held by former employees, board of directors and consultants of Arsanis that were vested as of the Merger. |  | $ | 817 |
Purchase price: |  | $ | 46,358 |
(1) | The number of shares of 2,440,582 represents the historical 14,643,737 shares of Arsanis common stock outstanding immediately prior to the closing of the Merger, adjusted for the Reverse Stock Split.
(2) | Based on the last reported sale price of Arsanis common stock on the Nasdaq Global Market on March 13, 2019, the closing date of the Merger, and gives effect to the Reverse Stock Split.
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed | The following summarizes the allocation of the purchase price to the net tangible and intangible assets acquired:
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 |
Business Acquisition, Pro Forma Information | The following supplemental unaudited pro forma information presents the Company’s financial results as if the acquisition of Arsanis had occurred on January 1, 2018:
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
|  | (unaudited) |
Revenue |  | $ | 0 |  |  | $ | 0 |
Net loss |  | $ | (16,258 | ) |  | $ | (20,235 | )

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of contingent payment arrangements including the terms that will result in payment and the accounting treatment that will be followed if such contingencies occur, including the potential impact on earnings per share if contingencies are to be settled in common stock of the entity. The description also may include the period over which amounts are expected to be paid, and changes in the amount since the previous reporting period. This also includes contingent options and commitments. + References No definition available. + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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