Thank you, Craig, and good afternoon, everyone. Before I begin my prepared remarks, I'd like to call your attention to our second quarter earnings press release that was issued earlier this morning. If you need a copy, it can be accessed on our website at ashs..com at Press Releases under the Investors tab.
Now turning to our second quarter results. For the 3 months ended June 30, 2020, total revenue decreased 23.2% to $3,991,000 compared to revenues of $5,197,000 for the second quarter of 2019. We had no revenue from the IGRT equipment this quarter compared to $188,000 in the second quarter of 2019 as the equipment was fully depreciated and sold after expiration of the company's contract on December 31, 2019.
Second quarter revenue for the company's Proton Therapy system installed at Orlando Health in Florida decreased 0.6% to $1,401,000 compared to revenue of the -- for the second quarter of 2019 of $1,409,000. Revenue for the company's Gamma Knife operations decreased 28.1% to $2,590,000 for the second quarter of 2020 compared to $3,600,000 for the second quarter of 2019. The decline was due to lower volumes as well as lower average reimbursement at the company's retail sites due to a higher mix of Medicare patients.
Gross margin for the second quarter of 2020 decreased to $907,000, or 22.7% of revenue compared to gross margin of $1,729,000, or 33.3% of revenue for the second quarter of 2019. Net loss for the second quarter of 2020 was $483,000, or $0.08 per share. This compares to net income for the second quarter of 2019 of $31,000, or $0.01 per share.
Fully diluted weighted average common shares outstanding were 6,077,000 and 5,906,000 for the second quarter of 2020 and 2019, respectively. Adjusted EBITDA, a non-GAAP financial measure was $1,437,000 for the second quarter of 2020 compared to $2,465,000 for the second quarter of 2019. The decline was primarily due to the net income loss as well as lower depreciation and amortization due to the company's IGRT equipment, which became fully depreciated in the fourth quarter of 2019. At June 30, cash, cash equivalents and restricted cash was $4,409,000 compared to $1,779,000 at December 31, 2019. Shareholders' equity at June 30, 2020, was $30,973,000 or $5.44 per outstanding share. This compares to shareholders' equity at December 31, 2019, of $31,811,000 or $5.47 per outstanding share. This concludes the formal part of our presentation. Vanessa, we'd like to now turn the call back over to you for questions.