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Fair Value Measurements - Additional information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Fair Value Measurements
Forward price		$ 10.00
Warrant redemption condition minimum share price		$ 18.00
Change in fair value of derivative warrant liabilities	$ 10,659,080	$ (16,101,880)

X

- Definition

Forward Purchase Per unit.

+ References

No definition available.

+ Details

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Namespace Prefix:	motv_
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Period Type:	duration

X

- 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

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Namespace Prefix:	motv_
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X

- 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=123570139&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

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- References

No definition available.

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