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Fair Value Measurements - Additional information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021
Fair Value Measurements |  |
Forward price |  | $ 10.00
Warrant redemption condition minimum share price |  | $ 18.00
Change in fair value of derivative warrant liabilities | $ 8,493,810 | $ (11,248,950)

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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 The minimum trading price for the reporting entity's stock which must be achieved as a condition for redemption of the warrant. + References No definition available. + Details
Name: | motv_WarrantRedemptionConditionMinimumSharePrice
Namespace Prefix: | motv_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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