Our additional non-GAAP measures include:
EBITDA. We define EBITDA as net income (loss), plus depreciation and amortization expense, plus interest expense, and plus the provision for (or minus benefit from) income taxes.
Adjusted EBITDA. We define Adjusted EBITDA as earnings before interest, taxes, depreciation and amortization, further adjusted for loss on satellite deorbit and launch failure, change in fair value of warrant liabilities, change in value of contingent earned liability, other (expense) income, net, stock-based compensation, other acquisition accounting amortization, mergers and acquisition related costs and expenses, and other unusual one-time costs. We believe Adjusted EBITDA can be useful in providing an understanding of the underlying operating results and trends and an enhanced overall understanding of our financial performance and prospects for the future. While Adjusted EBITDA is not a recognized measure under GAAP, management uses this financial measure to evaluate and forecast business performance. Adjusted EBITDA is not intended to be a measure of liquidity or cash flows from operations or a measure comparable to net income as it does not take into account certain requirements, such as capital expenditures and related depreciation, principal and interest payments, and tax payments. Adjusted EBITDA is not a presentation made in accordance with GAAP, and our use of the term Adjusted EBITDA may vary from the use of similarly titled measures by others in our industry due to the potential inconsistencies in the method of calculation and differences due to items subject to interpretation.
Other Definitions
Annual Recurring Revenue (ARR). We define ARR as our expected annualized revenue from customers that are under contract with us at the end of the reporting period with a binding and renewable agreement for our subscription solutions, or a customer that has a binding multi-year contract that can range from components of our Space Services solution to a project based customer solution. These customers are considered recurring when they have signed a multi-year binding agreement that has a renewable component in the contract or a customer that has multiple contracts that we continue to have under contract over multiple years.
ARR Customers. We define an ARR Customer as an entity that has a contract with us or through our reseller partners contracts, that is either a binding and renewable agreement for our subscription solutions, or a binding multi-year contract as of the measurement date independent of the number of solutions the entity has under contract. All entities that have customer contracts for data trials are excluded from the calculation of ARR Customers. A single organization with separate subsidiaries, segments, or divisions may represent multiple customers, as we treat each entity that is invoiced separately as an individual customer. In cases where customers subscribe to our platform through our reseller partners, each end customer that meets the above definition is counted separately as an ARR Customer.
ARR Solution Customers. We define an ARR Solution Customer similarly to an ARR Customer, but we count every solution the customer has with us separately. As a result, the count of ARR Solution Customers exceeds the count of ARR Customers in each year as some customers contract with us for multiple solutions. Our multiple solutions customers are those customers that are under contract for at least two of our solutions: Maritime, Aviation, Weather, and Space Services.