2.	Revenue Recognition

The Company generates product revenues from the sale of bioprocessing products to customers in the pharmaceutical and process chromatography industries. The Company recognizes revenue related to product sales upon delivery of the product to the customer as long as there is persuasive evidence of an arrangement, the sales price is fixed or determinable and collection of the related receivable is reasonably assured. Determination of whether these criteria have been met is based on management’s judgments primarily regarding the fixed nature of the fee charged for product delivered and the collectability of those fees. The Company has a few longstanding customers who comprise the majority of revenue and have an excellent payment history and therefore the Company does not require collateral. The Company has had no significant write-offs of uncollectible invoices in the periods presented.

At the time of sale, the Company also evaluates the need to accrue for warranty and sales returns. The supply agreements the Company has with its customers and the related purchase orders identify the terms and conditions of each sale and the price of the goods ordered. Due to the nature of the sales arrangements, inventory produced for sale is tested for quality specifications prior to shipment. Since the product is manufactured to order and in compliance with required specifications prior to shipment, the likelihood of sales return, warranty or other issues is largely diminished. Sales returns and warranty issues are infrequent and have had nominal impact on the Company’s financial statements historically.

In April 2008, the Company settled its litigation with Bristol-Myers Squibb Company (“Bristol”) and began recognizing royalty revenue in fiscal year 2009 for Bristol’s net sales in the United States of Orencia^® which is used in the treatment of rheumatoid arthritis. Pursuant to the settlement with Bristol (“Bristol Settlement”), the Company recognized royalty revenue of approximately $2,789,000 and $2,513,000 for the three months ended September 30, 2011 and 2010, respectively. For the six months ended September 30, 2011 and 2010, the Company recognized Bristol royalty revenue of approximately $5,562,000 and $4,992,000, respectively. Revenue earned from Bristol royalties is recorded in the periods when it is earned based on royalty reports sent by Bristol to the Company. The Company has no continuing obligations to Bristol as a result of this settlement.

Pursuant to the Bristol Settlement, Repligen must remit to the University of Michigan 15% of all royalty revenue received from Bristol. Royalty expense for the three months ended September 30, 2011 and 2010 was approximately $418,000 and $377,000, respectively. For the six months ended September 30, 2011 and 2010, the Company incurred royalty expense of approximately $834,000 and $749,000, respectively. This operating expense has been included in the Company’s Statements of Operations under the line item “Cost of royalty and other revenue.”

For the three months ended September 30, 2011, the Company recognized approximately $100,000 of revenue from a sponsored research and development project under an agreement with Go Friedreich’s Ataxia Research (“GoFar”). For the three months ended September 30, 2010, the Company recognized approximately $378,000 of revenue from sponsored research and development projects under agreements with the Muscular Dystrophy Association, GoFar, and the Friedreich’s Ataxia Research Alliance. For the six months ended September 30, 2011 and 2010, the Company recognized approximately $623,000 and $641,000 of revenue, respectively, under sponsored research and development projects.

Research revenue is recognized when the expense has been incurred and services have been performed. Determination of which incurred costs qualify for reimbursement under the terms of the Company’s contractual agreements and the timing of when such costs were incurred involves the judgment of management. The Company’s calculations are based on the agreed-upon terms as stated in the arrangements. However, should the estimated calculations change or be challenged by other parties to the agreements, research revenue may be adjusted in subsequent periods. The calculations have not historically changed or been challenged and the Company does not anticipate any subsequent change in its revenue related to sponsored research and development projects.

The Company recognizes milestone payments that meet the definition of a milestone in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Update (“ASU”) 2010-17 as revenue upon achievement of the milestone. At the inception of each arrangement that includes milestone payments, the Company evaluates whether each milestone is substantive. This evaluation includes an assessment of whether (a) the consideration is commensurate with either (1) the entity’s performance to achieve the milestone, or (2) the enhancement of the value of the delivered item(s) as a result of a specific outcome resulting from the entity’s performance to achieve the milestone, (b) the consideration relates solely to past performance and (c) the consideration is reasonable relative to all of the deliverables and payment terms within the arrangement. The Company evaluates factors such as the clinical, regulatory, commercial and other risks that must be overcome to achieve the respective milestone, the level of effort and investment required and whether the milestone consideration is reasonable relative to all deliverables and payment terms in the arrangement in making this assessment. If any of these factors are not met, the Company defers the recognition of revenue underlying the milestone payment and recognizes it over the remaining estimated period of performance under the contract as the Company performs its obligation.

There have been no material changes to the Company’s initial estimates related to revenue recognition in any periods presented in the accompanying consolidated financial statements.