Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 15, 2021	Jun. 30, 2020
Document Information Line Items
Entity Registrant Name	CF Finance Acquisition Corp. III
Document Type	10-K/A
Current Fiscal Year End Date	--12-31
Entity Public Float			$ 241,500,000
Amendment Flag	true
Amendment Description	CF Finance Acquisition Corp. III (the “Company”, “we”, “our” or “us”) is filing this Amendment No. 1 to its Annual Report on Form 10-K (this “Amendment”) to amend and restate certain items of its Annual Report on Form 10-K for the year ended December 31, 2020, originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 15, 2021 (the “Original Filing”). Restatement Background On April 12, 2021, the staff of the Securities and Exchange Commission (the “SEC Staff”) issued a public statement entitled “Staff Statement on Accounting and Reporting Considerations for Warrants issued by Special Purpose Acquisition Companies (“SPACs”)” (the “SEC Staff Statement”). In the SEC Staff Statement, the SEC Staff expressed its view that certain terms and conditions common to SPAC warrants may require the warrants to be classified as liabilities on the SPAC’s balance sheet as opposed to being treated as equity. Since their issuance on November 17, 2020 at the time of the Company’s initial public offering, our warrants were accounted for as equity within our balance sheet, and after discussion and evaluation, we have concluded that our warrants should be presented as liabilities with subsequent fair value remeasurement. Therefore, the Company, in consultation with the audit committee of the Company’s board of directors (the “Audit Committee”), concluded that its previously issued financial statements for the year ended December 31, 2020 should be restated because of a misapplication in the guidance around accounting for our outstanding warrants to purchase common stock (the “warrants”) should no longer be relied upon. Historically, the warrants were reflected as a component of equity as opposed to liabilities on the balance sheet and the statement of operations did not include the subsequent non-cash changes in estimated fair value of the warrants, based on our application of Financial Accounting Standards Board (the “FASB”) Accounting Standards Codification (“ASC”) Topic 815-40, Derivatives and Hedging - Contracts in Entity’s Own Equity (“ASC 815-40”). The views expressed in the SEC Staff Statement were not consistent with the Company’s historical interpretation of the specific provisions within its warrant agreements and the Company’s application of ASC 815-40 to the warrant agreement. We reassessed our accounting for the warrants issued on November 17, 2020, in light of the SEC Staff Statement. Based on this reassessment, we determined that the warrants should be classified as liabilities measured at fair value upon issuance, with any subsequent changes in fair value reported in our Statement of Operations each reporting period. The change in accounting for the warrants did not have any impact on our liquidity, cash flows, revenues or costs of operating our business and the other non-cash adjustments to the previously reported Financial Statements or in any of the periods included in Item 8, Financial Statements and Supplementary Data in this filing. The change in accounting for the warrants does not impact the amounts previously reported for the Company’s cash and cash equivalents, investments held in trust account, operating expenses or total cash flows from operations. Items Amended This Amendment presents the Original Filing, amended and restated with modifications as necessary to reflect the restatement. The following items in the Original Filing have been amended: Item 1, Business, Item 1A, Risk Factors, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operation, Item 8, Financial Statements and Supplementary Data, and Item 9A, Controls and Procedures. In addition, new certifications by the Company’s principal executive officer and principal financial officer are filed as exhibits (in Exhibits 31.1 and 32.2) to this Amendment. Furthermore, on April 30, 2021, the Company entered into Amendment No. 1 to the Merger Agreement dated February 17, 2021, in connection with which it also entered into Amendment No. 1 to the Sponsor Support Agreement dated February 17, 2021 and amended and restated the Stockholder Support Agreement dated February 17, 2021. Pursuant to Amendment No. 1 to the Sponsor Support Agreement, the sponsor funded the amount needed to extend the Company’s time to consummate its initial business combination from May 17, 2021 to September 17, 2021, and agreed to fund the amount needed to further extend the Company’s time to consummate its initial business combination to January 17, 2022, if necessary. For more information, see Item 1 of Part I hereof and Note 10 of the notes to the financial statements included herein as well as the Current Report on Form 8-K filed by the Company on May 4, 2021. Except as described above, this Amendment does not amend, update or change any other items or disclosures contained in the Original Filing, and accordingly, this Amendment does not reflect or purport to reflect any information or events occurring after the original filing date or modify or update those disclosures affected by subsequent events. Accordingly, this Amendment should be read in conjunction with the Original Filing and the Company’s other filings with the SEC.
Entity Central Index Key	0001818644
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
Entity File Number	001-39826
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		23,500,000
Class B Common Stock
Document Information Line Items
Entity Common Stock, Shares Outstanding		5,750,000