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DERIVATIVE LIABILITES - Forward Purchase Agreement (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Jun. 30, 2021
Class of Warrant or Right [Line Items] |  |
Forward purchase units |  | 14,000,000
Forward Purchase Per Unit | $ 10.00 | $ 10.00
Forward purchase amount |  | $ 140,000,000
Class A Ordinary Shares |  |
Class of Warrant or Right [Line Items] |  |
Number of shares in a unit | 1 | 1
Number of redeemable warrants | 1 | 1

X
- Definition Forward Purchase Amount. + References No definition available. + Details
Name: | motv_ForwardPurchaseAmount
Namespace Prefix: | motv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Forward Purchase Per unit. + References No definition available. + Details
Name: | motv_ForwardPurchasePerUnit
Namespace Prefix: | motv_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Forward purchase shares. + References No definition available. + Details
Name: | motv_ForwardPurchaseShares
Namespace Prefix: | motv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of shares in a unit. + References No definition available. + Details
Name: | motv_NumberOfSharesIssuedPerUnit
Namespace Prefix: | motv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of warrants in a unit. + References No definition available. + Details
Name: | motv_NumberOfWarrantsIssuedPerUnit
Namespace Prefix: | motv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |