Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies

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Basis of Presentation and Significant Accounting Policies
9 Months Ended
Sep. 30, 2011
Basis of Presentation and Significant Accounting Policies [Abstract]  
Basis of Presentation and Significant Accounting Policies
2.  Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The condensed consolidated financial statements include the accounts of XOMA and its subsidiaries. All intercompany accounts and transactions were eliminated during consolidation. The unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q. These financial statements and related disclosures have been prepared with the assumption that users of the interim financial information have read or have access to the audited financial statements for the preceding fiscal year. Accordingly, these statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2010, filed with the U.S. Securities and Exchange Commission (“SEC”) on March 10, 2011.

In the opinion of management, the unaudited condensed consolidated financial statements include all adjustments, consisting only of normal recurring adjustments, which are necessary to present fairly the Company's consolidated financial position as of September 30, 2011, the consolidated results of the Company's operations for the three and nine months ended September 30, 2011 and 2010, and the Company's cash flows for the nine months ended September 30, 2011 and 2010. The interim results of operations are not necessarily indicative of the results that may occur for the full fiscal year or future periods.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses, and related disclosures. On an on-going basis, management evaluates its estimates including, but not limited to, those related to revenue recognition, long-lived assets, warrant liabilities, derivative instruments and share-based compensation. The Company bases its estimates on historical experience and on various other market-specific and other relevant assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ significantly from these estimates, such as the Company's billing under government contracts. Under the Company's contracts with the National Institute of Allergy and Infectious Diseases (“NIAID”), a part of the National Institutes of Health (“NIH”), the Company bills using NIH provisional rates and thus are subject to future audits at the discretion of NIAID's contracting office. These audits can result in an adjustment to revenue previously reported.
 
Concentration of Risk

Cash equivalents and receivables are financial instruments, which potentially subject the Company to concentrations of credit risk, as well as liquidity risk for certain cash equivalents such as money market funds. The Company has not encountered such issues during 2011.

The Company has not experienced any significant credit losses and does not generally require collateral on receivables. For the nine months ended September 30, 2011, two customers represented 59% and 36% of total revenue and 45% and 52% of the accounts receivable balance.

For the nine months ended September 30, 2010, three customers represented 56%, 18%, and 14% of total revenues. As of December 31, 2010, there were receivables outstanding from two customers representing 72% and 23% of the accounts receivable balance.
 
Recent Accounting Pronouncements

In June of 2011, Accounting Standards Codification Topic 220, Comprehensive Income was amended to increase the prominence of items reported in other comprehensive income. Accordingly, a company can present all nonowner changes in stockholders' equity either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The Company plans to adopt this guidance as of January 1, 2012 on a retrospective basis and does not expect the adoption thereof to have a material effect on the Company's consolidated financial statements. The Financial Accounting Standards Board has proposed deferral of the requirement and if finalized, the Company would not adopt this guidance until January 1, 2013.

In May of 2011, Accounting Standards Codification Topic 820, Fair Value Measurement was amended to develop common requirements for measuring fair value and for disclosing information about fair value measurements in accordance with U.S. generally accepted accounting principles and International Financial Reporting Standards. The Company plans to adopt this guidance as of January 1, 2012 on a prospective basis and does not expect the adoption thereof to have a material effect on the Company's consolidated financial statements.

In March of 2010, Accounting Standards Codification Topic 605, Revenue Recognition was amended to define a milestone and clarify that the milestone method of revenue recognition is a valid application of the proportional performance model when applied to research or development arrangements. Accordingly, a company can make an accounting policy election to recognize a payment that is contingent upon the achievement of a substantive milestone in its entirety in the period in which the milestone is achieved. This guidance was adopted effective January 1, 2011 on a prospective basis and did not have a material effect on the Company's consolidated financial statements.