Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Offering cost	$ 11,146	$ 9,334

Adjustments to additional paid in capital stock issued offering costs.

No definition available.

Name:	vray_AdjustmentsToAdditionalPaidInCapitalStockIssuedOfferingCosts
Namespace Prefix:	vray_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration