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Summary of Significant Accounting Policies (Policies) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Going concern | In accordance with Accounting Standards Update (“ASU”) 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (Subtopic 205-40), the Company has evaluated whether there are conditions and events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year of the date of issue of the quarterly condensed consolidated financial statements. The Company has incurred operating losses since inception, including net losses of $27,893 and $12,117 for the six month periods ended June 30, 2018 and June 30, 2017, respectively, and a net loss of $29,406 for the year ended December 31, 2017. The Company had an accumulated deficit of $82,630 as of June 30, 2018. The Company expects to continue to incur net losses for the next several years and is highly dependent on its ability to find additional sources of funding in the form of debt or equity financing to fund its operations. Management believe that its cash and cash equivalents balance of $84,901 and short-term investments balance of $50,370 at June 30, 2018, are sufficient to fund operations through the fourth quarter of 2019. In making this assessment management have considered the Company’s available cash resources, the $15.0 million available under the secured credit facility with SVB, future financing options available to the Company, the planned operations of the Company and the ability to adjust its plans if required. The Company will then seek additional funding through public or private financing of debt or equity or collaboration agreements. There can be no assurances, however, that the current operating plan will be achieved or that additional funding will be available on terms acceptable to the Company, or at all.
Interim Financial Information | Interim Financial Information The condensed consolidated balance sheet at December 31, 2017 was derived from audited financial statements, but does not include all disclosures required by GAAP. The accompanying unaudited condensed consolidated financial statements as of June 30, 2018, and for six months ended June 30, 2018 and 2017, have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2017, included in the Company’s final prospectus for its initial public offering filed pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended (the “Securities Act”) with the SEC on May 25, 2018. In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s financial position as of June 30, 2018, and results of operations for the six months ended June 30, 2018 and 2017, and cash flows for the six months ended June 30, 2018 and 2017 have been made. The results of operations for the six months ended June 30, 2018 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2018.
Use of Estimates | Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, the accrual for research and development expenses, revenue from grant awards, the valuation of restricted ordinary shares and the valuation of share-based compensation awards. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates as there are changes in circumstances, facts and experience. Actual results could differ materially from those estimates.
Net Loss Per Ordinary Share | Net Loss Per Ordinary Share Basic and diluted net loss per ordinary share is determined by dividing net loss attributable to ordinary shareholders by the weighted-average ordinary shares outstanding during the period; in accordance with Accounting Standard Codification (ASC) 260, Earnings per Share. For the periods presented, the ordinary shares underlying the convertible preferred shares and options, and unvested restricted ordinary shares have been excluded from the calculation because they would be anti-dilutive. The following potentially dilutive securities have been excluded from the computation of diluted weighted-average shares outstanding as they would be anti-dilutive:
|  | Six months ended |
|  | June 30, 2018 |  |  | June 30, 2017 |
Options to purchase ordinary shares |  |  | 696,112 |  |  |  | 66,832 |
Preferred shares convertible into ordinary shares |  |  | — |  |  |  | 5,686,667 |
Unvested restricted ordinary shares |  |  | 143,076 |  |  |  | 246,282 |
Unvested restricted stock units |  |  | 36,924 |  |  |  | — |
Warrants |  |  | 19,890 |  |  |  | — |
Total |  |  | 896,002 |  |  |  | 5,999,781 |
Segment Information | Segment Information The Company determines and presents operating segments based on the information that is internally provided to the Chief Executive Officer, Chief Scientific Officer, Chief Financial Officer and Chief Commercial Officer, who together are considered the Company’s chief operating decision maker, in accordance with ASC 280, Segment Reporting. The Company has determined that it operates as a single business segment, which is the development and commercialization of innovative treatments for drug resistant bacterial infections. The distribution of total operating expenses by geographical area was as follows:
|  | Three months ended June 30, |  |  | Six months ended June 30, |
Operating expenses |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Ireland |  | $ | 12,811 |  |  | $ | 5,205 |  |  | $ | 22,775 |  |  | $ | 9,674 |
U.S. |  |  | 2,800 |  |  |  | 1,208 |  |  |  | 5,230 |  |  |  | 2,281 |
Total |  | $ | 15,611 |  |  | $ | 6,413 |  |  | $ | 28,005 |  |  | $ | 11,955 |
The distribution of long-lived assets by geographical area was as follows:
Long lived assets |  | June 30, 2018 |  |  | December 31, 2017 |
Ireland |  | $ | 3,388 |  |  | $ | 2,341 |
U.S. |  |  | 369 |  |  |  | 243 |
Total |  | $ | 3,757 |  |  | $ | 2,584 |
Recent Accounting Pronouncements | Recent Accounting Pronouncements In July 2017, the Financial Accounting Standards Board (FASB) issued ASU 2017-11, Earnings Per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), Derivatives and Hedging (Topic 815), I. Accounting for Certain Financial Instruments with Down Round Features, II. Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception. Part I applies to entities that issue financial instruments such as warrants, convertible debt or convertible preferred shares that contain down-round features. Part II replaces the indefinite deferral for certain mandatorily redeemable noncontrolling interests and mandatorily redeemable financial instruments of nonpublic entities contained within ASC Topic 480 with a scope exception and does not impact the accounting for these mandatorily redeemable instruments. ASU 2017-11 is required to be adopted for annual periods beginning after December 15, 2018, including interim periods within those fiscal years. The adoption of ASU 2017-11 is not expected to have a significant impact on the consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). ASU 2016-02 was issued to increase transparency and comparability among entities by recognizing lease assets and lease liabilities on the consolidated balance sheet and disclosing key information about lease arrangements. ASU 2016-02 is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently evaluating the impact of adopting ASU 2016-02 on the consolidated financial statements.

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