MARKETABLE SECURITIES (Narrative) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Marketable Securities [Abstract]
Carrying value of equity securities and our marketable securities	$ 2,570

Carrying value of equity securities and our marketable securities.

No definition available.

Name:	rdwr_EquitySecuritiesAndOtherMarketableSecurities
Namespace Prefix:	rdwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant