Document And Entity Information - USD ($)	5 Months Ended
	Dec. 31, 2020	Mar. 29, 2021
Document Information Line Items
Entity Registrant Name	Motion Acquisition Corp.
Document Type	10-K/A
Current Fiscal Year End Date	--12-31
Entity Public Float	$ 0
Amendment Flag	true
Amendment Description	References throughout this Amendment No. 1 to the Annual Report on Form 10-K/A to “we,” “us,” the “Company” or “our company” are to Motion Acquisition Corp., unless the context otherwise indicates. This Amendment No. 1 to the Annual Report on Form 10-K/A (this “report”) amends the Annual Report on Form 10-K of Motion Acquisition Corp. for the fiscal year ended December 31, 2020, as filed with the Securities and Exchange Commission (“SEC”) on March 30, 2021 (the “Original Report”). On April 12, 2021, the staff of the SEC (the “SEC Staff”) issued a public statement (the “SEC Staff Statement”) entitled “Staff Statement on Accounting and Reporting Considerations for Warrants issued by Special Purpose Acquisition Companies (“SPACs”)”. In the SEC Staff Statement, the SEC Staff expressed its view that certain terms and conditions common to warrants issued by SPACs may require the warrants to be classified as liabilities instead of equity on the SPAC’s balance sheet. Since the date of their issuance in connection with our initial public offering on October 19, 2020 (the “IPO”) and until the date of the restatements, our warrants were reflected as a component of equity instead of liabilities on our balance sheet and, based on our application of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 815-40, Derivatives and Hedging, Contracts in Entity’s Own Equity (“ASC 815-40”), our statement of operations did not include the subsequent non-cash changes in estimated fair value of the warrants. The views expressed in the SEC Staff Statement were not consistent with our historical interpretation of specific provisions within our warrant agreement, dated as of October 14, 2020 (the “warrant agreement”), and our application of ASC 815-40 to the warrant agreement. After discussion, evaluation and consultation with management, our audit committee concluded that our warrants should be presented as liabilities with subsequent fair value remeasurement. Prior to filing this report, in consultation with our audit committee, we concluded that our audited financial statements for the period from August 11, 2020 (inception) to December 31, 2020 (the “Affected Period”), should no longer be relied upon and should be restated and that the warrants should be classified as liabilities measured at fair value upon issuance, with subsequent changes in fair value reported in our statement of operations each reporting period. On May 10, 2021, our audit committee authorized management to restate its audited financial statements for the year ended December 31, 2020 (the “restatements”). We are filing this report to include additional Risk Factors under Item 1A, a revised Management’s Discussion and Analysis of Financial Condition and Results of Operations described in Item 7, and to incorporate the restatements in the Financial Statements and Supplementary Data described in Item 8, which such financial data give effect to the change in accounting for the warrants that is reflected in this report. The change in accounting for the warrants reflected in the restatements did not have any impact on our liquidity, cash flows, costs of operating our business or other non-cash adjustments during the Affected Period or during any other period for which financial information is included in this report. Our cash and cash equivalents, investments held in the trust account, operating expenses or total cash flows from operations during the Affected Period also were not affected. In accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), Item 1A, Risk Factors, is hereby amended to add additional risk factors, and Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, and Item 8, Financial Statements and Supplementary Data, of the Original Report are hereby amended and restated in their entirety. This report should be read in conjunction with our filings with the SEC subsequent to the Original Report, including amendments thereto. Items Amended in this Report This report presents the Original Report, amended and restated with modifications necessary to reflect the restatements, but without any other amendments, modifications or updates. As such, this report speaks only as of the date the Original Report was filed, and should be read in conjunction with our other SEC filings, including our SEC filings subsequent to the date of the Original Report. The following items have been amended to reflect the restatements: Part I, Item 1A. Risk Factors Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations Part II, Item 8. Financial Statements and Supplementary Data Part II, Item 9A. Controls and Procedures In addition, the Company’s Chief Executive Officer and Chief Financial Officer have provided new certifications dated as of the date of this filing in connection with this report (Exhibits 31.1, 31.2, 32.1 and 32.2).
Entity Central Index Key	0001822359
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Shell Company	true
Entity Ex Transition Period	false
Document Transition Report	false
Entity File Number	001-39618
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Class A Common Stock
Document Information Line Items
Entity Common Stock, Shares Outstanding		11,500,000
Class B Common Stock
Document Information Line Items
Entity Common Stock, Shares Outstanding		2,875,000