As described above, the Company excludes the following items from one or more of its non-GAAP measures when applicable:
Employee stock-based compensation expense. These expenses consist primarily of expenses for employee stock options and employee restricted stock under ASC 718 (formerly SFAS 123(R)). The Company excludes employee stock-based compensation expenses from its non-GAAP measures primarily because they are non-cash expenses that the Company does not believe are reflective of ongoing operating results in the period incurred. Further, as the Company applies ASC 718, it believes that it is useful to investors to understand the impact of the application of ASC 718 on its results of operations.
Termination of License. The Company incurred a one-time expense of $5.4 million in the fourth quarter of 2011 related to the acceleration of the remaining amortization of the original up-front license fee related to the Roche license. The Company excludes this item because it is one-time and non-cash in nature and not reflective of ongoing operating results in the period incurred.
Amortization of purchased intangible assets. The Company incurs amortization of purchased intangible assets in connection with acquisitions. The Company excludes these items because these expenses are not reflective of ongoing operating results in the period incurred. These amounts arise from the Company's prior acquisitions and have no direct correlation to the operation of the Company's business.
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