Commitments and Contingencies	9 Months Ended
Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Real Estate Obligations We lease our office and laboratory space in The Omeros Building under a lease agreement with BMR-201 Elliott Avenue LLC (BMR). The initial term of the lease ends in November 2027 and we have two options to extend the lease term, each by five years. As of September 30, 2014, the remaining aggregate non-cancelable rent payable under the initial term of the lease is approximately $59.4 million. The deferred rent balance relates to rent deferrals since the inception of our lease. Deferred rent is being amortized to research and development and selling, general and administrative expense on a straight-line basis through the term of the lease. Contracts In June 2014, we entered into an agreement with Ventiv Commercial Services, LLC (inVentiv) for field sales representatives and related sales operation services for the U.S. commercial launch of Omidria. As of September 30, 2014, we had a monthly fee of approximately $300,000, which began in August 2014. We can terminate the agreement upon 30 days written notice if Omidria is withdrawn from the market for any reason or a regulatory agency acts to prevent or materially restrict the sale of Omidria, or upon 90 days written notice any time subsequent to January 2016. In October 2014, we entered into an amendment to the agreement with inVentiv for additional sales representatives in the U.S. Under the terms of the amendment, our total monthly fee will increase to approximately $630,000 upon inVentiv providing additional sales representatives, which is expected in January 2015, and will continue through January 2016. We have a non-exclusive agreement with Patheon Manufacturing Services LLC (Patheon) for commercial supply of Omidria through December 31, 2015. Pursuant to the terms of the contract, we are required to provide a monthly, non-binding production forecast covering the term of the contract. Upon submission of the monthly forecast, a portion of the forecast becomes a firm purchase commitment. In the event we do not purchase the quantities included in the firm purchase commitment, we would owe a cancellation fee. As of September 30, 2014, we had a firm purchase commitment requiring payment of approximately $519,000. In October 2014, we entered into a non-exclusive agreement with Hospira S.p.A and Hospira Worldwide, Inc. (together, “Hospira”) for commercial supply of Omidria. We have no firm purchase commitments under this agreement until, in connection with the commencement of commercial manufacturing of Omidria at Hospira, we provide monthly rolling forecasts that will be used to calculate our firm purchase commitment. We have not commenced commercial manufacturing of Omidria at Hospira and, therefore, do not currently have any firm purchase commitments under this agreement. Development Milestones and Product Royalties We have retained worldwide commercial rights to Omidria and all of our product candidates in our clinical and preclinical programs. We potentially owe certain development milestones and sales based royalties on commercial sales of certain product candidates within our pipeline. These are low-single-digit royalties based on net sales or net income as more fully described in our 2013 Annual Report on Form 10-K filed with the SEC on March 13, 2014. During the first quarter of 2014, we incurred a milestone payment of $200,000 to Helion Biotech ApS (Helion) related to the filing of an Investigational New Drug Application (IND) with the FDA for our mannan-binding lectin-associated serine protease-2 (MASP-2) program. Other In the first quarter of 2013, we recorded $900,000 as selling, general and administrative expense in connection with previously awarded NIH grants.

Commitments and Contingencies

Real Estate Obligations

We lease our office and laboratory space in The Omeros Building under a lease agreement with BMR-201 Elliott Avenue LLC (BMR). The initial term of the lease ends in November 2027 and we have two options to extend the lease term, each by five years. As of September 30, 2014, the remaining aggregate non-cancelable rent payable under the initial term of the lease is approximately $59.4 million. The deferred rent balance relates to rent deferrals since the inception of our lease. Deferred rent is being amortized to research and development and selling, general and administrative expense on a straight-line basis through the term of the lease.

Contracts

In June 2014, we entered into an agreement with Ventiv Commercial Services, LLC (inVentiv) for field sales representatives and related sales operation services for the U.S. commercial launch of Omidria. As of September 30, 2014, we had a monthly fee of approximately $300,000, which began in August 2014. We can terminate the agreement upon 30 days written notice if Omidria is withdrawn from the market for any reason or a regulatory agency acts to prevent or materially restrict the sale of Omidria, or upon 90 days written notice any time subsequent to January 2016.

In October 2014, we entered into an amendment to the agreement with inVentiv for additional sales representatives in the U.S. Under the terms of the amendment, our total monthly fee will increase to approximately $630,000 upon inVentiv providing additional sales representatives, which is expected in January 2015, and will continue through January 2016.

We have a non-exclusive agreement with Patheon Manufacturing Services LLC (Patheon) for commercial supply of Omidria through December 31, 2015. Pursuant to the terms of the contract, we are required to provide a monthly, non-binding production forecast covering the term of the contract. Upon submission of the monthly forecast, a portion of the forecast becomes a firm purchase commitment. In the event we do not purchase the quantities included in the firm purchase commitment, we would owe a cancellation fee. As of September 30, 2014, we had a firm purchase commitment requiring payment of approximately $519,000.

In October 2014, we entered into a non-exclusive agreement with Hospira S.p.A and Hospira Worldwide, Inc. (together, “Hospira”) for commercial supply of Omidria. We have no firm purchase commitments under this agreement until, in connection with the commencement of commercial manufacturing of Omidria at Hospira, we provide monthly rolling forecasts that will be used to calculate our firm purchase commitment. We have not commenced commercial manufacturing of Omidria at Hospira and, therefore, do not currently have any firm purchase commitments under this agreement.

Development Milestones and Product Royalties

We have retained worldwide commercial rights to Omidria and all of our product candidates in our clinical and preclinical programs. We potentially owe certain development milestones and sales based royalties on commercial sales of certain product candidates within our pipeline. These are low-single-digit royalties based on net sales or net income as more fully described in our 2013 Annual Report on Form 10-K filed with the SEC on March 13, 2014.

During the first quarter of 2014, we incurred a milestone payment of $200,000 to Helion Biotech ApS (Helion) related to the filing of an Investigational New Drug Application (IND) with the FDA for our mannan-binding lectin-associated serine protease-2 (MASP-2) program.

Other

In the first quarter of 2013, we recorded $900,000 as selling, general and administrative expense in connection with previously awarded NIH grants.