| Document and Entity Information | Jul. 29, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | Jul. 29, 2022 |
| Entity Registrant Name | FISCALNOTE HOLDINGS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-396972 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address, Address Line One | 1201 Pennsylvania Avenue NW |
| Entity Address, Address Line Two | 6th Floor |
| Entity Address, City or Town | Washington |
| Entity Address, State or Province | DC |
| Entity Address, Postal Zip Code | 20004 |
| City Area Code | 202 |
| Local Phone Number | 793-5300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Description | On July 29, 2022 (the “Closing”), the registrant, FiscalNote Holdings, Inc. (formerly known as Duddell Street Acquisition Corp.) (the “Company”) consummated the previously announced acquisition of FiscalNote Intermediate Holdco, Inc. (formerly FiscalNote Holdings, Inc.) (“Old FiscalNote”), pursuant to that certain Agreement and Plan of Merger, dated as of November 7, 2021 (as amended by the First Amendment to Agreement and Plan of Merger, dated May 9, 2022), by and among Duddell Street Acquisition Corp. (“DSAC”), Old FiscalNote and Grassroots Merger Sub, Inc., a wholly owned subsidiary of DSAC (“Merger Sub”), pursuant to which Merger Sub merged with and into Old FiscalNote, with Old FiscalNote surviving the merger. Unless the context otherwise requires, “DSAC” refers to the registrant prior to the Closing, and “we”, “us,” “our” and the “Company” refer to the registrant and its subsidiaries, including Old FiscalNote, following the Closing. This Amendment No. 1 to Current Report on Form 8-K/A (the “Amendment No. 1”) amends the Current Report on Form 8-K of the Company, filed on August 2, 2022 (the “Original Form 8-K”), in which the Company reported, among other events, the consummation of the Business Combination (as defined in the Original Form 8-K). This Amendment No. 1 is being filed to include the financial statements of Old FiscalNote for the six months ended June 30, 2022, including pro forma financial statements as of such time period. This Amendment No. 1 does not amend any other item of the Original Form 8-K or purport to provide an update or a discussion of any developments at the Company or its subsidiaries subsequent to the filing date of the Original Form 8-K. The information previously reported in or filed with the Original Form 8-K is hereby incorporated by reference into this Form 8-K/A. |
| Entity Central Index Key | 0001823466 |
| Class A shares [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | NOTE |
| Security Exchange Name | NYSE |
| Redeemable warrants, each warrant exercisable for one Class A ordinary share at an exercise price of $11.50 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants to purchase one share of Class A common stock |
| Trading Symbol | NOTE.WS |
| Security Exchange Name | NYSE |
