Cornerstone's management regularly uses supplemental non-GAAP financial measures to understand, manage and evaluate the Company's business and make operating decisions. These non-GAAP measures are among the primary factors management uses in planning for and forecasting future periods.These non-GAAP measures are not in accordance with or an alternative to measures prepared in accordance with GAAP and may be different from similarly titled non-GAAP measures used by other companies. In addition, these non-GAAP measures are not based on any comprehensive set of accounting rules or principles. The additional non-GAAP financial information presented here should be considered in conjunction with, and not as a substitute for or superior to the financial information presented in accordance with GAAP (such as operating income, net income and earnings per share) and should not be considered measures of the Company's liquidity. These non-GAAP measures should only be used to evaluate the Company's results of operations in conjunction with the corresponding GAAP measures. The non-GAAP financial measures reflect adjustments for stock-based compensation expense, amortization of product rights and acquisition-related expenses. Acquisition-related expenses consist of certain expenses which were incurred in connection with the 2009 transaction with Chiesi, including additional stock-based compensation due to the accelerated vesting of certain stock options and shares of restricted stock resulting from the closing of the transaction. The Company excludes these expenses from its non-GAAP measures because management believes that their exclusion provides an additional means to assess the extent to which management's efforts and execution of its strategy are reflected in the Company's operating results. In particular, stock-based compensation expense is excluded primarily because it is a non-cash expense that is determined based on subjective assumptions, product rights amortization is excluded because it is not reflective of the cash-settled expenses incurred related to product sales, and acquisition-related expenses are excluded because they arise from prior acquisitions and management believes they have no direct correlation to current operating results. Management believes that these non-GAAP measures, when shown in conjunction with the corresponding GAAP measures, enhance investors' and management's overall understanding of the Company's current financial performance and the Company's prospects for the future.