Convertible Senior Notes - Summary of Net Carrying Amount of Equity Component of 2025 and 2026 Notes (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Shares related to convertible senior notes due 2026
Debt Instrument [Line Items]
Proceeds allocated to the conversion option (debt discount)	$ 138,923
Issuance cost	(2,085)
Net carrying amount	136,838
Shares related to convertible senior notes due 2025
Debt Instrument [Line Items]
Proceeds allocated to the conversion option (debt discount)	195,074
Issuance cost	(2,632)
Net carrying amount	$ 192,442

Debt Instrument, Convertible, Issuance Cost, Net, Allocable To Equity Component

No definition available.

Name:	rng_DebtInstrumentConvertibleIssuanceCostNetAllocableToEquityComponent
Namespace Prefix:	rng_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument convertible net carrying amount of equity component.

+ References

No definition available.

+ Details

Name:	rng_DebtInstrumentConvertibleNetCarryingAmountOfEquityComponent
Namespace Prefix:	rng_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=rng_ConvertibleSeniorNotesDueTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rng_ConvertibleSeniorNotesDueTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: