Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 02, 2021	Jun. 30, 2020
Document Information Line Items
Entity Registrant Name	GX Acquisition Corp.
Document Type	10-K/A
Current Fiscal Year End Date	--12-31
Entity Public Float			$ 293,250,000
Amendment Flag	true
Amendment Description	GX Acquisition Corp. (the “Company,” “we”, “our” or “us”) is filing this Annual Report on Form 10-K/A (Amendment No. 1), or this Annual Report, to amend our Annual Report on Form 10-K for the period ended December 31, 2020, originally filed with the Securities and Exchange Commission, or the SEC, on March 4, 2021, or the Original Filing, to restate our consolidated financial statements for the period ended December 31, 2020. We are also restating the financial statements as of May 23, 2019; as of and for the year ended December 31, 2019; and as of and for the periods ended June 30, 2019, September 30, 2019, March 31, 2020, June 30, 2020 and September 30, 2020 in the accompanying financial statements included in this Annual Report, including describing the restatement and its impact on previously reported amounts. The restatement results from the Company’s prior accounting for its outstanding warrants issued in connection with its initial public offering and concurrent private placement in May 2019 as components of equity instead of as derivative liabilities. The warrant agreement governing the warrants includes a provision that provides for potential changes to the settlement amounts dependent upon the characteristics of the holder of the warrant. In addition, the warrant agreement includes a provision that in the event of a tender or exchange offer made to and accepted by holders of more than 50% of the outstanding shares of a single class of common shares, all holders of the warrants would be entitled to receive cash for their warrants (the “tender offer provision”). In other words, in the event of a qualifying cash tender offer (which could be outside the control of the Company), all warrant holders would be entitled to cash, while only certain of the holders of the underlying common shares would be entitled to cash. Subsequent to the audit of the Company’s financial statements for the period ended December 31, 2020, the Company’s management reevaluated the warrants under Accounting Standards Codification (“ASC”) Subtopic 815-40, Contracts in Entity’s Own Equity. ASC Section 815-40-15 addresses equity versus liability treatment and classification of equity-linked financial instruments, including warrants, and states that a warrant may be classified as a component of equity only if, among other things, the warrant is indexed to the issuer’s common stock. Under ASC Section 815-40-15, a warrant is not indexed to the issuer’s common stock if the terms of the warrant require an adjustment to the exercise price upon a specified event and that event is not an input to the fair value of the warrant. Based on management’s reevaluation, the Company’s audit committee, in consultation with management and after discussion with the Company’s independent registered public accounting firm, concluded that the Company’s warrants are not indexed to the Company’s common shares in the manner contemplated by ASC Section 815-40-15 because the holder of the instrument is not an input into the pricing of a fixed-for-fixed option on equity shares. In addition, based on management’s reevaluation, the Company’s audit committee, in consultation with management and after discussion with the Company’s independent registered public accounting firm, concluded the tender offer provision included in the warrant agreement fails the “classified in shareholders’ equity” criteria as contemplated by ASC Section 815-40-25. As a result of the above, the Company should have classified the warrants as derivative liabilities in its previously issued financial statements. Under this accounting treatment, the Company is required to measure the fair value of the warrants at the end of each reporting period and recognize changes in the fair value from the prior period in the Company’s operating results for the current period. The Company’s accounting for the warrants as components of equity instead of as derivative liabilities did not have any effect on the Company’s previously reported operating expenses, cash flows or cash. In connection with the restatement, the Company’s management reassessed the effectiveness of its disclosure controls and procedures for the periods affected by the restatement. As a result of that reassessment, the Company’s management determined that its disclosure controls and procedures for such periods were not effective with respect to the classification of the Company’s warrants as components of equity instead of as derivative liabilities. For more information, see Item 9A included in this Annual Report on Form 10-K/A. The Company has not amended its previously filed Current Report on Form 8-K, Annual Report on Form 10-K or Quarterly Reports on Form 10-Q for the periods affected by the restatement. The financial information that has been previously filed or otherwise reported for these period is superseded by the information in this Annual Report on Form 10-K/A, and the financial statements and related financial information contained in such previously filed reports should no longer be relied upon. The restatement is more fully described in Note 2 of the notes to the financial statements included herein. 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 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 officers and principal financial officer are filed as exhibits (in Exhibits 31.1, 31.2, 31.3, 32.1, 32.2 and 32.3) to this Amendment. Except as described above, this Amendment does not amend, update or change any other items or disclosures contained in the Original Filing and 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	0001752828
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	001-38914
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		28,750,000
Class B common stock
Document Information Line Items
Entity Common Stock, Shares Outstanding		7,187,500