Significant Accounting Policies. The accompanying (a) condensed consolidated balance sheet as of December 31, 2013, which has been derived from our audited financial statements, and (b) the unaudited condensed consolidated financial statements, have been prepared in accordance with accounting principles and Securities and Exchange Commission (“SEC”) rules applicable to interim financial information. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, the unaudited condensed consolidated financial statements included in this report contain all adjustments (consisting only of normal recurring adjustments and accruals) necessary for a fair presentation of the Company’s consolidated financial position as of September 30, 2014 and its consolidated results of operations for the three and nine months ended September 30, 2014 and 2013, and related statements of comprehensive earnings for the three and nine months ended September 30, 2014 and 2013 and cash flows for the nine months ended September 30, 2014 and 2013. The accounting policies followed by the Company are set forth in Note A to the Company’s audited financial statements included in its Annual Report on Form 10-K for its fiscal year ended December 31, 2013 (the “2013 10-K”), which was filed with the SEC on March 31, 2014. The unaudited interim consolidated financial statements included in this report, and the notes that follow, should be read in conjunction with the consolidated financial statements and related notes included in our 2013 10-K.

The preparation of consolidated financial statements in conformity with generally accepted accounting principles as in effect in the United States (GAAP) requires us to make estimates and assumptions that affect amounts reported and disclosed in the financial statements and the accompanying notes. On an ongoing basis, we evaluate our estimates, including those related to the accounts receivable and sales allowances, and useful lives of property and equipment, fair values of stock-based awards, income taxes, warranty liability, and other contingent liabilities, among others. We base our estimates on historical experience and on various assumptions that we believe are reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. However, such estimates and the assumptions on which they were based may later prove to have been incorrect due to unforeseen changes in market or economic conditions or the occurrence of unexpected events. As a result, the carrying values of our assets and our results of operations could differ in the future from the carrying values and the results of operations that were based on our earlier estimates and assumptions. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates” in Item 2 of Part I of this report.