including customers from acquired companies, renew their software license updates and product support contracts when the contracts are eligible for renewal and we strive to renew cloud software subscription and hardware systems support contracts. To the extent cloud software subscription, software support or hardware systems support contracts are renewed, we will recognize the revenues for the full values of the contracts over the contracts’ periods, which are generally one year in duration.

In connection with a business combination, we estimate costs associated with restructuring plans committed to by our management. Restructuring costs are typically comprised of employee severance costs, costs of consolidating duplicate facilities and contract termination costs. Restructuring expenses are based upon plans that have been committed to by our management, but may be refined in subsequent periods. We account for costs to exit or restructure certain activities of an acquired company separately from the business combination. These costs are accounted for as one-time termination and exit costs pursuant to ASC 420, Exit or Disposal Cost Obligations . A liability for a cost associated with an exit or disposal activity is recognized and measured at its fair value in our consolidated statement of operations in the period in which the liability is incurred. When estimating the fair value of facility restructuring activities, assumptions are applied regarding estimated sub-lease payments to be received, which can differ materially from actual results. This may require us to revise our initial estimates which may materially affect our results of operations and financial position in the period the revision is made.

For a given acquisition, we may identify certain pre-acquisition contingencies as of the acquisition date and may extend our review and evaluation of these pre-acquisition contingencies throughout the measurement period in order to obtain sufficient information to assess whether we include these contingencies as a part of the fair value estimates of assets acquired and liabilities assumed and, if so, to determine their estimated amounts.

If we cannot reasonably determine the fair value of a pre-acquisition contingency (non-income tax related) by the end of the measurement period, which is generally the case given the nature of such matters, we will recognize an asset or a liability for such pre-acquisition contingency if: (i) it is probable that an asset existed or a liability had been incurred at the acquisition date and (ii) the amount of the asset or liability can be reasonably estimated. Subsequent to the measurement period, changes in our estimates of such contingencies will affect earnings and could have a material effect on our results of operations and financial position.

In addition, uncertain tax positions and tax related valuation allowances assumed in connection with a business combination are initially estimated as of the acquisition date. We reevaluate these items quarterly based upon facts and circumstances that existed as of the acquisition date with any adjustments to our preliminary estimates being recorded to goodwill