Derivative Instrument, Contingent Consideration, Liability

No definition available.

Name:	rovr_DerivativeInstrumentContingentConsiderationLiability
Namespace Prefix:	rovr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of financial and nonfinancial obligations.

+ References

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=rovr_PrivateWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=rovr_PublicWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Fair Value - Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jul. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Liabilities
Derivative warrant liabilities	$ 34,294	$ 22,000	$ 0
Private Warrants
Liabilities
Derivative warrant liabilities	7,700
Fair Value, Recurring
Assets
Total assets measured at fair value	37,859		37,854	$ 51,221
Liabilities
Earnout liabilities	266,390
Total liabilities measured at fair value	300,684
Fair Value, Recurring \| Public Warrants
Liabilities
Derivative warrant liabilities	23,320
Fair Value, Recurring \| Private Warrants
Liabilities
Derivative warrant liabilities	10,974
Fair Value, Recurring \| Money market fund
Assets
Money market fund	37,859		37,854	15,088
Fair Value, Recurring \| Level 1
Assets
Total assets measured at fair value	37,859		37,854	15,088
Liabilities
Earnout liabilities	0
Total liabilities measured at fair value	23,320
Fair Value, Recurring \| Level 1 \| Public Warrants
Liabilities
Derivative warrant liabilities	23,320
Fair Value, Recurring \| Level 1 \| Private Warrants
Liabilities
Derivative warrant liabilities	0
Fair Value, Recurring \| Level 1 \| Money market fund
Assets
Money market fund	37,859		37,854	15,088
Fair Value, Recurring \| Level 2
Assets
Total assets measured at fair value	0		0	36,133
Liabilities
Earnout liabilities	0
Total liabilities measured at fair value	0
Fair Value, Recurring \| Level 2 \| Public Warrants
Liabilities
Derivative warrant liabilities	0
Fair Value, Recurring \| Level 2 \| Private Warrants
Liabilities
Derivative warrant liabilities	0
Fair Value, Recurring \| Level 2 \| Money market fund
Assets
Money market fund	0		0	0
Fair Value, Recurring \| Level 3
Assets
Total assets measured at fair value	0		0	0
Liabilities
Earnout liabilities	266,390
Total liabilities measured at fair value	277,364
Fair Value, Recurring \| Level 3 \| Public Warrants
Liabilities
Derivative warrant liabilities	0
Fair Value, Recurring \| Level 3 \| Private Warrants
Liabilities
Derivative warrant liabilities	10,974
Fair Value, Recurring \| Level 3 \| Money market fund
Assets
Money market fund	$ 0		$ 0	0
Commercial paper
Assets
Investments				6,032
Commercial paper \| Level 1
Assets
Investments				0
Commercial paper \| Level 2
Assets
Investments				6,032
Commercial paper \| Level 3
Assets
Investments				0
Corporate securities
Assets
Investments				19,323
Corporate securities \| Level 1
Assets
Investments				0
Corporate securities \| Level 2
Assets
Investments				19,323
Corporate securities \| Level 3
Assets
Investments				0
Asset-backed securities
Assets
Investments				660
Asset-backed securities \| Level 1
Assets
Investments				0
Asset-backed securities \| Level 2
Assets
Investments				660
Asset-backed securities \| Level 3
Assets
Investments				0
Certificate of deposits
Assets
Investments				10,118
Certificate of deposits \| Level 1
Assets
Investments				0
Certificate of deposits \| Level 2
Assets
Investments				10,118
Certificate of deposits \| Level 3
Assets
Investments				$ 0