Document And Entity Information	6 Months Ended
	Jun. 30, 2021
Document Information Line Items
Entity Registrant Name	Motion Acquisition Corp.
Document Type	S-4/A
Amendment Flag	true
Amendment Description	AMENDMENT NO. 5
Entity Central Index Key	0001822359
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Incorporation, State or Country Code	DE