Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Mar. 25, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	ViewRay, Inc.
Entity Central Index Key	0001597313
Document Type	10-K
Trading Symbol	VRAY
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		38,216,523
Entity Public Float			$ 0
Entity Current Reporting Status	No
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2015