Adjusted EBITDA and Non-GAAP net income, earnings per share, operating expenses, and gross margin are supplemental measures of our performance that are not required by, or presented in accordance with, GAAP. These non-GAAP financial measures are not intended to be used in isolation and, moreover, they should not be considered as a substitute for net income, diluted earnings per share, operating expenses, gross margin or any other performance measure determined in accordance with GAAP. We present adjusted EBITDA and non-GAAP net income, earnings per share, operating expenses, and gross margin because we consider each to be an important supplemental measure of our performance.
Management uses these non-GAAP financial measures to make operational decisions, evaluate the Company's performance, prepare forecasts and determine compensation. Further, management believes that both management and investors benefit from referring to these non-GAAP financial measures in assessing the Company's performance when planning, forecasting and analyzing future periods. The stock-based compensation expenses are expected to vary depending on the number of new grants issued to both current and new employees, and changes in the Company’s stock price, stock market volatility, expected option life and risk-free interest rates, all of which are difficult to estimate. In calculating non-GAAP operating expenses, net income and earnings per share, management excludes stock-based compensation expenses and charges related to M&A activity to facilitate comparability of the Company's operating performance on a period-to-period basis because such expenses are not, in management's review, related to the Company's ongoing operating performance. Management uses this view of its operating performance for purposes of comparison with its business plan and individual operating budgets and allocation of resources.
We further believe that these non-GAAP financial measures are useful to investors in providing greater transparency to the information used by management in its operational decision making. We believe that the use of non-GAAP operating expenses, net income and earnings per share also facilitates a comparison of Novatel Wireless’ underlying operating performance with that of other companies in our industry, which use similar non-GAAP financial measures to supplement their GAAP results.