Background and Organization - Additional Information (Detail) $ / shares in Units, $ in Thousands				3 Months Ended
	May. 09, 2016 USD ($)	Aug. 17, 2015 USD ($) $ / shares shares	Jul. 08, 2015 $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Mar. 31, 2015 USD ($)	Dec. 31, 2015 $ / shares shares	Jul. 21, 2015 $ / shares shares	Jul. 20, 2015 $ / shares shares	Jul. 07, 2015 $ / shares shares	Jun. 26, 2015 USD ($)
Background And Organization [Line Items]
Description of the stock split arrangement				On July 8, 2015, ViewRay, Inc. (f/k/a Mirax Corp.), or ViewRay, we, us, our or the Company, completed a 1.185763-for-1 forward stock split of our common stock in the form of a dividend with the result that 4,343,339 shares of common stock, par value $0.001 per share, outstanding immediately prior to the stock split became 5,150,176 shares of common stock, par value $0.001 per share, outstanding immediately thereafter.
Stock split conversion ratio			1.185763
Common stock, shares outstanding | shares			5,150,176	38,216,523		38,204,960			4,343,339
Common stock, par value | $ / shares			$ 0.001	$ 0.01		$ 0.01	$ 0.01	$ 0.001	$ 0.001
Common stock, shares authorized | shares				300,000,000		300,000,000	300,000,000	75,000,000
Net loss from operations				$ (12,070)	$ (8,032)
Net cash used from operations				(10,490)	$ (9,604)
CRG Term Loan
Background And Organization [Line Items]
Remaining borrowing capacity										$ 20,000
Subsequent Event | CRG Term Loan
Background And Organization [Line Items]
Proceeds from draw down of debt	$ 5,000
Remaining borrowing capacity	$ 10,000
Scenario Plan
Background And Organization [Line Items]
Additional working capital				$ 15,000
Private Placement
Background And Organization [Line Items]
Private placement, common shares | shares		5,884,504
Purchase price of share common stock, per share | $ / shares		$ 5.00
Private placement, value		$ 26,300
Blank Check Preferred Stock
Background And Organization [Line Items]
Preferred stock, shares authorized | shares							10,000,000
Preferred stock, par value | $ / shares							$ 0.01