Adjusted EBITDA for the six months ended December 31, 2017 was $7.9 million, compared to $2.9 million in the prior fiscal year period.
2018 Financial Guidance

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The company is reaffirming the revenue, gross orders, and adjusted EBITDA, guidance originally provided on August 22, 2017 as follows:
Revenue: $390.0 million to $400.0 million representing growth of approximately 2 percent to 4 percent year-over-year with product revenue growing approximately 5 to 10 percent year-over-year;
Gross Orders growth of approximately 5 percent year-over-year; and
Adjusted EBITDA: $25.0 million to $30.0 million representing growth of approximately 23 percent to 47 percent year-over-year
Guidance for non-GAAP financial measures excludes amortization of intangibles, depreciation, stock-based compensation expense, interest expense, net and provision for income taxes. For more information regarding the non-GAAP financial measures discussed in this press release, please see "Use of Non-GAAP Financial Measures" below.
Conference Call Information
Accuray will host a conference call beginning at 1:30 p.m. PT/4:30 p.m. ET today to discuss its fiscal second quarter results and recent corporate developments. Conference call dial-in information is as follows:
U.S. callers: (855) 867-4103
International callers: (262) 912-4764
Conference ID Number (U.S. and international): 8185998
Individuals interested in listening to the live conference call via the Internet may do so by logging on to Accuray's website, www.accuray.com. In addition, a taped replay of the conference call will be available beginning approximately two hours after the call's conclusion and available for seven days. The replay telephone number is (855) 859-2056 (USA) or (404) 537-3406 (International), Conference ID: 8185998. An archived webcast will also be available at Accuray's website.
Use of Non-GAAP Financial Measures
Accuray has supplemented its GAAP net loss with a non-GAAP measure of adjusted earnings before interest, taxes, depreciation, amortization and stock-based compensation ("adjusted EBITDA"). Management believes that this non-GAAP financial measure provides useful supplemental information to management and investors regarding the performance of the company and facilitates a meaningful comparison of results for current periods with previous operating results. A reconciliation of GAAP net loss (the most directly comparable GAAP measure) to non-GAAP adjusted EBITDA is provided in the financial statement tables included in this press release, and investors are encouraged to review this reconciliation.