COMMITMENTS & CONTINGENCIES (Details) - USD ($)	3 Months Ended	6 Months Ended
Dec. 31, 2020	Jun. 30, 2021
Underwriting cash discount per unit	$ 0.35	$ 0.35
Aggregate underwriter cash discount	$ 14,490,000	$ 14,490,000
Over-allotment option
Period to exercise the over-allotment option	45 days	45 days
Additional units granted to underwriters to purchase	14,490,000	14,490,000

Period to exercise the over-allotment option from the date of the final prospectus, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	motv_PeriodToExerciseOverAllotmentOption
Namespace Prefix:	motv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration