Description of Business	6 Months Ended
Jun. 30, 2021
Description of Business
Description of Business	Note 1—Description of Business Description of Business We are a commercial-stage biopharmaceutical company committed to discovering, developing and commercializing small-molecule and protein therapeutics for large-market as well as orphan indications targeting inflammation, complement-mediated diseases, disorders of the central nervous system, addiction and immune-related diseases, including cancers. Our first drug product, OMIDRIA^® (phenylephrine and ketorolac intraocular solution) 1%/0.3%, is marketed in the United States (“U.S.”) for use during cataract surgery or intraocular lens replacement. OMIDRIA qualifies for separate payment when used on Medicare Part B patients in ambulatory surgery centers under a policy adopted by the Centers for Medicare and Medicaid Services (“CMS”) in 2019 and directed to non-opioid pain management surgical drugs. Our drug candidate narsoplimab is the subject of a biologics license application (“BLA”) under priority review by the U.S. Food and Drug Administration (“FDA”) for the treatment of hematopoietic stem cell transplant-associated thrombotic microangiopathy (“HSCT-TMA”). We also have multiple late-stage clinical development programs in our pipeline, which are focused on: complement-mediated disorders, including immunoglobulin A (“IgA”) nephropathy, atypical hemolytic uremic syndrome (“aHUS”) and COVID-19. Basis of Presentation Our condensed consolidated financial statements include the financial position and results of operations of Omeros Corporation (“Omeros”) and our wholly owned subsidiaries. All intercompany transactions have been eliminated, and we have determined we operate in one segment. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. The information as of June 30, 2021 and December 31, 2020 and for the three and six months ended June 30, 2021 and 2020 includes all adjustments, which include normal recurring adjustments, necessary to present fairly our interim financial information. The Condensed Consolidated Balance Sheet at December 31, 2020 has been derived from our audited financial statements but does not include all of the information and footnotes required by GAAP for audited annual financial information. The accompanying unaudited condensed consolidated financial statements and related notes thereto should be read in conjunction with the audited consolidated financial statements and related notes thereto that are included in our Annual Report on Form 10-K for the year ended December 31, 2020, which was filed with the U.S. Securities and Exchange Commission (“SEC”) on March 1, 2021. Risks and Uncertainties The COVID-19 pandemic and the responses to it by various governmental authorities, the medical community and others have had a significant impact on our business. It is not possible to estimate precisely the future impact of the COVID-19 pandemic on our business, operations or financial results due to the unknown magnitude, duration and outcome of the pandemic. We have filed with FDA our BLA for narsoplimab in HSCT-TMA, which has been granted priority review with an FDA action date of October 17, 2021 under the Prescription Drug User Fee Act (“PDUFA”). We anticipate, but cannot guarantee, that narsoplimab will receive FDA approval and will commercially launch in the U.S. in 2021. Our sales and marketing strategies for the commercial launch of narsoplimab for HSCT-TMA include various milestones at which we commit to incremental spending, providing for flexibility in the timing of costs incurred should the approval of narsoplimab be delayed. If approved, we cannot fully predict the timing or the magnitude of narsoplimab revenues. We plan to continue to fund our operations for the next twelve months with our cash and investments from sales of OMIDRIA and, if FDA approval is granted, from sales of narsoplimab for HSCT-TMA. In addition, we may utilize funds available under our line of credit, which allows us to borrow up to 85% of our available accounts receivable borrowing base, less certain reserves, or $50.0 million, whichever is less. The line of credit matures August 2, 2022. We also entered into a sales agreement to sell shares of our common stock, from time to time, up to an aggregate offering amount of $150.0 million through an “at the market” equity offering program. Should it be necessary or determined to be strategically advantageous, we could pursue debt financings as well as public and private offerings of our equity securities, similar to those we have previously completed, or other strategic transactions, which may include licensing a portion of our existing technology. Should it be necessary to manage our operating expenses, we would reduce our projected cash requirements by delaying clinical trials, reducing selected research and development efforts, or implementing other restructuring activities. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant items subject to such estimates include revenue recognition, stock-based compensation expense and accruals for clinical trials as well as manufacturing of drug product. We base our estimates on historical experience and on various other factors, including the impact of the COVID-19 pandemic, that we believe are reasonable under the circumstances; however, actual results could differ from these estimates.

Description of Business

6 Months Ended

Jun. 30, 2021

Note 1—Description of Business

Description of Business

We are a commercial-stage biopharmaceutical company committed to discovering, developing and commercializing small-molecule and protein therapeutics for large-market as well as orphan indications targeting inflammation, complement-mediated diseases, disorders of the central nervous system, addiction and immune-related diseases, including cancers.

Our first drug product, OMIDRIA^® (phenylephrine and ketorolac intraocular solution) 1%/0.3%, is marketed in the United States (“U.S.”) for use during cataract surgery or intraocular lens replacement. OMIDRIA qualifies for separate payment when used on Medicare Part B patients in ambulatory surgery centers under a policy adopted by the Centers for Medicare and Medicaid Services (“CMS”) in 2019 and directed to non-opioid pain management surgical drugs.

Our drug candidate narsoplimab is the subject of a biologics license application (“BLA”) under priority review by the U.S. Food and Drug Administration (“FDA”) for the treatment of hematopoietic stem cell transplant-associated thrombotic microangiopathy (“HSCT-TMA”). We also have multiple late-stage clinical development programs in our pipeline, which are focused on: complement-mediated disorders, including immunoglobulin A (“IgA”) nephropathy, atypical hemolytic uremic syndrome (“aHUS”) and COVID-19.

Basis of Presentation

Our condensed consolidated financial statements include the financial position and results of operations of Omeros Corporation (“Omeros”) and our wholly owned subsidiaries. All intercompany transactions have been eliminated, and we have determined we operate in one segment. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. The information as of June 30, 2021 and December 31, 2020 and for the three and six months ended June 30, 2021 and 2020 includes all adjustments, which include normal recurring adjustments, necessary to present fairly our interim financial information. The Condensed Consolidated Balance Sheet at December 31, 2020 has been derived from our audited financial statements but does not include all of the information and footnotes required by GAAP for audited annual financial information.

The accompanying unaudited condensed consolidated financial statements and related notes thereto should be read in conjunction with the audited consolidated financial statements and related notes thereto that are included in our Annual Report on Form 10-K for the year ended December 31, 2020, which was filed with the U.S. Securities and Exchange Commission (“SEC”) on March 1, 2021.

Risks and Uncertainties

The COVID-19 pandemic and the responses to it by various governmental authorities, the medical community and others have had a significant impact on our business. It is not possible to estimate precisely the future impact of the COVID-19 pandemic on our business, operations or financial results due to the unknown magnitude, duration and outcome of the pandemic.

We have filed with FDA our BLA for narsoplimab in HSCT-TMA, which has been granted priority review with an FDA action date of October 17, 2021 under the Prescription Drug User Fee Act (“PDUFA”). We anticipate, but cannot guarantee, that narsoplimab will receive FDA approval and will commercially launch in the U.S. in 2021. Our sales and marketing strategies for the commercial launch of narsoplimab for HSCT-TMA include various milestones at which we

commit to incremental spending, providing for flexibility in the timing of costs incurred should the approval of narsoplimab be delayed. If approved, we cannot fully predict the timing or the magnitude of narsoplimab revenues.

We plan to continue to fund our operations for the next twelve months with our cash and investments from sales of OMIDRIA and, if FDA approval is granted, from sales of narsoplimab for HSCT-TMA. In addition, we may utilize funds available under our line of credit, which allows us to borrow up to 85% of our available accounts receivable borrowing base, less certain reserves, or $50.0 million, whichever is less. The line of credit matures August 2, 2022. We also entered into a sales agreement to sell shares of our common stock, from time to time, up to an aggregate offering amount of $150.0 million through an “at the market” equity offering program. Should it be necessary or determined to be strategically advantageous, we could pursue debt financings as well as public and private offerings of our equity securities, similar to those we have previously completed, or other strategic transactions, which may include licensing a portion of our existing technology. Should it be necessary to manage our operating expenses, we would reduce our projected cash requirements by delaying clinical trials, reducing selected research and development efforts, or implementing other restructuring activities.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant items subject to such estimates include revenue recognition, stock-based compensation expense and accruals for clinical trials as well as manufacturing of drug product. We base our estimates on historical experience and on various other factors, including the impact of the COVID-19 pandemic, that we believe are reasonable under the circumstances; however, actual results could differ from these estimates.