Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2019
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, 2018 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.
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.
Research and Development Expenses	Research and Development Expenses Research and development expenses are charged to operations as incurred. Research and development expenses include, among other things, salaries, costs of outside collaborators and outside services, allocated facility, occupancy and utility expenses, which are partially offset by the benefit of tax incentive payments for qualified research and development expenditures from the Australian tax authority (“AU Tax Rebates”). The Company does not record AU Tax Rebates until payment is received due to the uncertainty of receipt.
Warrants	Leases We lease all of our research, manufacturing and office space and have entered into various other agreements in conducting our business. At inception, we determine whether an agreement represents a lease and at commencement we evaluate each lease agreement to determine whether the lease is an operating or financing lease. As described under “Recently Adopted Accounting Standards”, we adopted the ASU 2016-02 as of January 1, 2019. Pursuant to ASU 2016-02, all of our leases outstanding on January 1, 2019 continued to be classified as operating leases. With the adoption of the ASU, we recorded an operating lease right-of-use asset and an operating lease liability on our balance sheet. Right-of-use lease assets represent our right to use the underlying asset for the lease term and the lease liability represents our commitment to make the lease payments in accordance with the lease agreement. Right-of-use lease assets and obligations are recognized at the commencement date based on the present value of remaining lease payments over the lease term. As the Company’s leases do not provide an implicit rate, we have used an estimated incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The right-of-use lease asset includes any lease payments made prior to commencement and excludes lease incentives, if any. The lease term may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Operating lease expense is recognized on a straight-line bases over the lease term, subject to any changes in the lease or expectations regarding the terms. Variable lease costs such as common area costs are expensed as incurred. For all lease agreements, we combine lease and non-lease components, if any. Leases with an initial term of 12 months or less are not recorded on the balance sheet. Warrants Warrants 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 warrants. 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 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 August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820). The new guidance removes, modifies and adds to certain disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement. This new guidance will be effective for the company as of January 1, 2020. The Company plans to adopt this ASU as of January 1, 2020 and does not anticipate the adoption will have a material impact on its consolidated financial position or results of operations. Recently Adopted Accounting Standards In June 2018, the FASB issued ASU No. 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting, which amends the FASB Accounting Standards Codification in order to simplify the accounting for share-based payments granted to nonemployees for goods and services. Under the ASU, most of the guidance on such payments to nonemployees will be aligned with the requirements for share-based payments granted to employees. The guidance mandates the modified retrospective approach and is effective for annual and interim reporting periods beginning after December 31, 2018, with early adoption permitted. The Company elected to early adopt this ASU as of June 30, 2018 and the adoption did not have an impact on the Company’s consolidated financial statements. In February 2016, 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 Company has elected to adopt ASU 2016-02 retrospectively at January 1, 2019 using a simplified transition option that allows companies to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings or accumulated deficit. We have also elected to adopt the package of practical expedients permitted in ASC Topic 842. Accordingly, we are continuing to account for our existing operating leases as operating leases under the new guidance, without reassessing whether the agreements contain a lease under ASC 842. All of our leases at the adoption date were operating leases for facilities and did not include any non-lease components. As a result of the adoption of ASU 2016-02, on January 1, 2019 we recognized (i) a lease liability of approximately $310,000, which represents the present value of our remaining lease payments using an estimated incremental borrowing rate of 9%, and (ii) a right-of-use asset of approximately $310,000. There was no cumulative-effect adjustment to accumulated deficit. Lease expense is not expected to change materially as a result of the adoption of ASU 2016-02