Subsequent Events - Additional Information (Details)							6 Months Ended
Subsequent Events - Additional Information (Details)	Aug. 12, 2025 USD ($)	Aug. 05, 2025 USD ($) $ / shares	Jul. 30, 2025	Jul. 01, 2025 USD ($)	Mar. 25, 2025	Oct. 31, 2024 USD ($)	Jun. 30, 2025 USD ($) TradingDay $ / shares	Jun. 30, 2024 USD ($)
Subsequent Event [Line Items]
Proceeds from issuance of debt								$ 801,000
Repayment of long term debt							$ 27,172,000	$ 65,754,000
Amended Legacy Notes
Subsequent Event [Line Items]
Maturity description							On July 30, 2025, the Company and the holders of the Amended Legacy Notes agreed to extend the original maturity date to August 15, 2025.
Legacy Notes
Subsequent Event [Line Items]
Maturity description					The Maturity Date of the Legacy Notes was July 31, 2025 (the “Original Maturity Date”), however, the Amendment extends the Original Maturity Date to April 15, 2026 (the "Extended Maturity Date"). The repayment of the Legacy Notes may be accelerated upon certain events of default, as defined with the Legacy Notes.
Maturity date					Jul. 31, 2025
2025 Senior Term Loan
Subsequent Event [Line Items]
Debt Instrument, Description of Variable Rate Basis							Obligations under the 2025 Senior Term Loan bear interest at variable rates, set at the Company’s option, based on a reference rate plus 7%, or the secured overnight financing rate as administered by the Federal Reserve Bank of New York (“SOFR”) plus 8%. Interest is payable in cash monthly in arrears.
Debt instrument, payment description							The 2025 Senior Term Loan is repayable in consecutive quarterly installments on the last business day of each March, June, September and December of each fiscal year commencing September 30, 2025, in an amount equal to (i) $468,750 with respect to each payment due on September 30, 2025, December 31, 2025, March 31, 2026 and June 30, 2026 and (ii) $937,500 with respect to each payment due thereafter, with the remaining principal amount due at the maturity of the 2025 Senior Term Loan in August 2029 or such earlier time as it may become payable.
Convertible Debentures
Subsequent Event [Line Items]
Aggregate principal amount							$ 12,300,000
Annual effective interest rate							5.00%
Lowest daily volume weighted average trading price							94.00%
Average daily VWAPs							20.00%
Trading days \| TradingDay							5
Consecutive trading days \| TradingDay							7
Debt instrument, maturity date							Feb. 12, 2027
Conversion price \| $ / shares							$ 0.25
Interest rate in event of default							18.00%
Ten Trading Days \| Convertible Debentures
Subsequent Event [Line Items]
Consecutive trading days \| TradingDay							10
Era Convertible Note \| Convertible Notes
Subsequent Event [Line Items]
Maturity date							Dec. 08, 2027
Lenders agreed advance amount							$ 6,301,000
Third Era Convertible Note [Member] \| Convertible Notes
Subsequent Event [Line Items]
Maturity date							Mar. 17, 2028
Lenders agreed advance amount							$ 5,769,000
Third Era Convertible Note [Member] \| Convertible Debentures
Subsequent Event [Line Items]
Amount of outstanding obligations							$ 11,100,000
Aicel Technologies
Subsequent Event [Line Items]
Acquisition consideration						$ 9,650,000
Cash consideration						8,500,000
Accrued paid in kind interest						1,150,000
Proceeds from Business Combination, net of transaction costs						$ 5,000,000
Subsequent Event \| Timebase
Subsequent Event [Line Items]
Cash received				$ 6,600,000
Subsequent Event \| Senior Term Loan \| Timebase
Subsequent Event [Line Items]
Repayments of debt				$ 3,200,000
Subsequent Event \| Amended Legacy Notes
Subsequent Event [Line Items]
Maturity date			Aug. 15, 2025
Cash paid	$ 3,600,000
Amount of outstanding obligations	3,600,000
Subsequent Event \| 2025 Senior Term Loan
Subsequent Event [Line Items]
Lenders agreed advance amount		$ 75,000,000
Debt instrument, interest rate		7.00%
Quarterly installments repayable	468,750,000
Quarterly installments payment due thereafter	937,500,000
Debt instrument, date of first required payment		Sep. 30, 2025
Aggregate principal amount	30,000,000
Proceeds from issuance of debt	72,900,000
Debt instrument, maturity date		Aug. 12, 2029
Subsequent Event \| 2025 Senior Term Loan \| SOFR
Subsequent Event [Line Items]
Debt instrument, interest rate		8.00%
Subsequent Event \| Convertible Debentures
Subsequent Event [Line Items]
Aggregate principal amount	21,000,000	$ 33,300,000
Cash purchase price		$ 30,000,000
Proceeds from issuance of debt	18,900,000
Subsequent Event \| GPO Convertible Note
Subsequent Event [Line Items]
Amount of outstanding obligations	30,000,000
Repayment of long term debt	27,000,000
Subsequent Event \| 2025 GPO Note
Subsequent Event [Line Items]
Debt instrument, date of first required payment		Apr. 01, 2026
Aggregate principal amount	20,400,000
Proceeds from issuance of debt	$ 20,400,000
Interest rate		7.50%
Debt instrument, maturity date	Nov. 11, 2029	Nov. 13, 2029
Conversion price \| $ / shares		$ 6.91
Installment payments		quarterly
Payments of outstanding principal		$ 2,000,000
Subsequent Event \| Ten Trading Days \| 2025 GPO Note
Subsequent Event [Line Items]
VWAP of common stock		95.00%
Subsequent Event \| Ninety Calendar Day \| 2025 GPO Note
Subsequent Event [Line Items]
VWAP of common stock		95.00%

FiscalNote Holdings, Inc. 10-Q