Background and Organization	3 Months Ended
Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Background and Organization	1.Background and Organization ViewRay, Inc., or ViewRay or the Company, and its wholly owned subsidiary ViewRay Technologies, Inc., designs, manufactures and markets MRIdian, an MR Image-Guided radiation therapy system to simultaneously image and treat cancer patients. Since inception, ViewRay Technologies, Inc. has devoted substantially all of its efforts towards research and development, initial selling and marketing activities, raising capital and the manufacturing and shipment of MRIdian systems. In May 2012, ViewRay Technologies, Inc. was granted clearance from the U.S. Food and Drug Administration, or FDA, to sell MRIdian with Cobalt-60. In November 2013, ViewRay Technologies, Inc. received its first clinical acceptance of a MRIdian with Cobalt-60 at a customer site, and the first patient was treated with that system in January 2014. ViewRay Technologies, Inc. has had the right to affix the CE mark to MRIdian with Cobalt-60 in the European Economic Area since November 2014. In September 2016, the Company received the rights to affix the CE mark to MRIdian Linac, and in February 2017, the Company received 510(k) clearance from the FDA to market MRIdian Linac. The Company’s condensed consolidated financial statements have been prepared on the basis of the Company continuing as a going concern for a reasonable period of time. The Company’s principal sources of liquidity are cash flows from public and private offerings of capital stock and available borrowings under its term loan agreement, as well as cash from the sale of its systems and services. These have historically been sufficient to meet working capital needs, capital expenditures, and debt service obligations. During the three months ended March 31, 2018, the Company incurred a net loss of $4.8 million, and used cash in operations of $37.5 million. The Company believes that its existing cash balance of $78.9 million as of March 31, 2018, together with anticipated cash receipts from sales of MRIdian systems is sufficient to fund its operations for at least the next 12 months.

1.Background and Organization

ViewRay, Inc., or ViewRay or the Company, and its wholly owned subsidiary ViewRay Technologies, Inc., designs, manufactures and markets MRIdian, an MR Image-Guided radiation therapy system to simultaneously image and treat cancer patients.

Since inception, ViewRay Technologies, Inc. has devoted substantially all of its efforts towards research and development, initial selling and marketing activities, raising capital and the manufacturing and shipment of MRIdian systems. In May 2012, ViewRay Technologies, Inc. was granted clearance from the U.S. Food and Drug Administration, or FDA, to sell MRIdian with Cobalt-60. In November 2013, ViewRay Technologies, Inc. received its first clinical acceptance of a MRIdian with Cobalt-60 at a customer site, and the first patient was treated with that system in January 2014. ViewRay Technologies, Inc. has had the right to affix the CE mark to MRIdian with Cobalt-60 in the European Economic Area since November 2014. In September 2016, the Company received the rights to affix the CE mark to MRIdian Linac, and in February 2017, the Company received 510(k) clearance from the FDA to market MRIdian Linac.

The Company’s condensed consolidated financial statements have been prepared on the basis of the Company continuing as a going concern for a reasonable period of time. The Company’s principal sources of liquidity are cash flows from public and private offerings of capital stock and available borrowings under its term loan agreement, as well as cash from the sale of its systems and services. These have historically been sufficient to meet working capital needs, capital expenditures, and debt service obligations. During the three months ended March 31, 2018, the Company incurred a net loss of $4.8 million, and used cash in operations of $37.5 million. The Company believes that its existing cash balance of $78.9 million as of March 31, 2018, together with anticipated cash receipts from sales of MRIdian systems is sufficient to fund its operations for at least the next 12 months.