Significant Accounting Policies (Policies)	6 Months Ended
Significant Accounting Policies (Policies)	Jun. 30, 2017
Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements of the Company should be read in conjunction with the audited financial statements and notes thereto as of and for the year ended December 31, 2016 included in the Company’s Annual Report on Form 10‑K, filed with the SEC. The accompanying financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial statements and in accordance with the instructions to Form 10-Q. Any reference in these notes to applicable guidance is meant to refer to authoritative U.S. GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”). In the opinion of management, the accompanying consolidated financial statements include all adjustments that are of a normal and recurring nature and that are necessary for the fair presentation of the Company’s financial position and the results of its operations and cash flows for the periods presented. Interim results are not necessarily indicative of results for the full year or any future period.
Reverse Stock Split	Reverse Stock Split On April 21, 2017, the Company filed Articles of Amendment to Amended and Restated Articles of Incorporation with the Secretary of State of the State of Washington that effected a 1-for-10 (1:10) reverse stock split of its common stock, par value $0.01 per share, effective April 24, 2017. All common share, warrant, stock option, and per share information in the consolidated financial statements gives retroactive effect to the 1-for-10 reverse stock split that was effected on April 24, 2017. In connection with the reverse stock split, the Company adjusted its authorized common stock, from 670,000,000 to 67,000,000 shares. The par value of its common stock was unchanged at $0.01 per share, post-split. The Company adjusted stockholders' equity to reflect the reverse stock split by reclassifying an amount equal to the par value of the shares eliminated by the split from common stock to additional paid-in capital, resulting in no net impact to stockholders' equity on the consolidated balance sheets.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in its consolidated financial statements and accompanying notes. On an ongoing basis, management evaluates these estimates and judgments, which are based on historical and anticipated results and trends and on various other assumptions that management believes to be reasonable under the circumstances. By their nature, estimates are subject to an inherent degree of uncertainty and, as such, actual results may differ from management’s estimates.
In Process Research and Development	In Process Research and Development In Process Research & Development (“IPR&D”) assets represent capitalized incomplete research projects that were acquired through business combinations. Such assets are initially measured at their acquisition date fair values, and accounted for as indefinite-lived intangible assets, subject to impairment testing until completion or abandonment of research and development efforts associated with the projects. Management periodically re-evaluates whether continuing to characterize the asset as indefinite-lived is appropriate. Since December 31, 2016 and through the first quarter of 2017, the Company had IPR&D assets related to its Staph and Pseudomonas programs of $5.2 million and $5.3 million, respectively. Management assessed the qualitative indicators for impairment and noted no negative operational indicators for its research and development programs. However, as of June 30, 2017, the Company’s market capitalization was approximately $6.7 million, well below the Company’s carrying amount of net assets. As the Company’s shares of common stock are publicly-traded, the market capitalization is an indicator of the fair value which is evaluated against the Company’s net asset values. The significant excess of net asset value over market capitalization as of June 30, 2017 existed following the 1-for-10 reverse stock split completed in April 2017 and the receipt of $10.6 million in gross proceeds from an underwritten public offering in May 2017. In connection with the preparation and review of the Company’s financial statements included in this report, management determined that the IPR&D assets were impaired as of June 30, 2017. Based on the indicators above, the Company assessed the fair value of its IPR&D assets and determined an impairment charge of $5.8 million, off-set by a related income tax benefit of $1.3 million, was necessary in the second quarter of 2017. The impairment was due to an increase in the Company’s discount rate as compared to previous assessments due to the significant difference between the Company’s net assets and its market capitalization. The carrying amount of the Staph and Pseudomonas programs after the impairment charge was $2.8 million and $1.9 million, respectively. The impairment charge was included as a component of operating expense in the consolidated statements of operations for the three and six months ended June 30, 2017.
Accounting for Warrant and Preferred Shares Conversion and Dilutive Financing Features	Accounting for Warrant and Preferred Shares Conversion and Dilutive Financing Features Warrants and preferred shares conversion and dilutive financing features are accounted for in accordance with the applicable accounting guidance provided in ASC 815 - Derivatives and Hedging as either derivative liabilities or as equity instruments depending on the specific terms of the agreements. Liability-classified instruments are recorded at fair value at each reporting period with any change in fair value recognized as a component of change in fair value of derivative liabilities in the consolidated statements of operations (see Note 4).
Recent Accounting Pronouncements	Recent Accounting Pronouncements Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The ASU creates a single source of revenue guidance for companies in all industries. The new standard provides guidance for all revenue arising from contracts with customers and affects all entities that enter into contracts to provide goods or services to their customers, unless the contracts are within the scope of other accounting standards. It also provides a model for the measurement and recognition of gains and losses on the sale of certain nonfinancial assets. This guidance, as amended, must be adopted using either a full retrospective approach for all periods presented or a modified retrospective approach and will be effective for fiscal years beginning after December 15, 2017 with early adoption permitted. The Company plans to adopt this ASU on January 1, 2018, and is in the process of evaluating the impact of adopting the guidance on its consolidated financial statements. In February 2015, the FASB issued ASU No. 2016-02, Leases (Topic 842), which amends the FASB Accounting Standards Codification and creates Topic 842, "Leases." The new topic supersedes Topic 840, "Leases," and increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and requires disclosures of key information about leasing arrangements. The guidance is effective for reporting periods beginning after December 15, 2018. ASU 2016-02 mandates a modified retrospective transition method. The Company plans to adopt this ASU on January 1, 2019 and is in the process of evaluating the impact of adopting the guidance on its consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Cash Flow Statements, Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow classification issues with the objective of reducing diversity in practice. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company's consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other, Simplifying the Accounting for Goodwill Impairment. ASU 2017-04 removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance will remain largely unchanged. Entities will continue to have the option to perform a qualitative assessment to determine if a quantitative impairment test is necessary. This new guidance will be applied prospectively, and is effective for calendar year end companies in 2020. Early adoption is permitted for any impairment tests performed after January 1, 2017. Adoption of this ASU is not expected to have a material impact on the Company’s consolidated financial statements. In July 2017, the FASB issued ASU No. 2017-11, which amends the FASB Accounting Standards Codification. Part I of ASU No. 2017-11, Accounting for Certain Financial Instruments with Down Round Features, changes the classification analysis of certain equity-linked financial instruments (or embedded features) with down round features. The guidance is effective for reporting periods beginning after December 15, 2019 and interim periods within those fiscal years. The Company is in the process of evaluating the impact of adopting the guidance on its consolidated financial statements. Recently Adopted Accounting Standards In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern, which defines management's responsibility to assess an entity's ability to continue as a going concern, and to provide related footnote disclosures if there is substantial doubt about its ability to continue as a going concern. The Company adopted this ASU as of December 31, 2016 and conformed its footnote disclosure in accordance with the disclosure requirements under this standard. In November 2015, the FASB issued ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes. The ASU is part of a simplification initiative aimed at reducing complexity in accounting standards. Current U.S. GAAP requires the deferred taxes for each jurisdiction (or tax-paying component of a jurisdiction) to be presented as a net current asset or liability and net noncurrent asset or liability. To simplify presentation, the new guidance requires that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as noncurrent on the balance sheet. The Company adopted this ASU as of January 1, 2017 and the adoption did not have an impact on the Company’s consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation – Stock Compensation, (Topic 718). This ASU changes certain aspects of accounting for share-based payments to employees and involves several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Specifically, ASU 2016-09 requires that all income tax effects of share-based awards be recognized as income tax expense or benefit in the reporting period in which they occur. Additionally, ASU 2016-09 amends existing guidance to allow forfeitures of share-based awards to be recognized as they occur. Previous guidance required that share-based compensation expense include an estimate of forfeitures. The Company adopted this ASU as of January 1, 2017 and elected to account for forfeitures as they occur. The cumulative effect of adoption was made on a modified retrospective basis and resulted in an increase of $8,000 to both additional paid-in capital and accumulated deficit.