Notes Payable - Additional Information (Details) - USD ($)				12 Months Ended
	Feb. 06, 2024	Sep. 07, 2023	Jan. 11, 2022	Dec. 31, 2025	Dec. 31, 2024	Jan. 26, 2024
Debt Instrument [Line Items]
Common stock, Par value				$ 0.00001	$ 0.00001	$ 0.00001
Cash and/or certain permitted cash equivalent investments				$ 81,540,000	$ 67,464,000
2022 Convertible Notes
Debt Instrument [Line Items]
Convertible notes converted into common stock	1,841,321
Convertible price	$ 12
Principal amount			$ 20,100,000
Issued date			Jul. 11, 2023
2022 Convertible Notes \| After Amendments
Debt Instrument [Line Items]
Common stock, Par value			$ 0.00001
Outstanding principal amount				$ 20,900,000
Interest rate upon amendments				10.00%
2023 Notes
Debt Instrument [Line Items]
Interest rate margin		5.50%
Interest rate		13.25%
Interest rate terms		The outstanding balances of the 2023 Notes bear interest at a floating annual rate equal to the greater of 5.5% above the Wall Street Journal prime rate or 13.25%.
Principal amount		$ 45,000,000
Financial covenants, Description				The Credit Agreement contains a minimum liquidity covenant that requires the Company to maintain a $10.0 million minimum balance in cash and/or certain permitted cash equivalent investments, subject to certain exceptions. In addition, the Credit Agreement contains a customary events of default, subject to rights and remedies generally applicable to federal law or the laws of the State of Delaware.
Financial covenants, Compliance				As of December 31, 2025, the Company was in compliance with the financial covenants and other terms of the arrangement. The Company’s obligations under the Credit Agreement are collateralized by substantially all of its assets, including its intellectual property, but excluding certain customary and agreed upon assets.
First principal payment date		Sep. 30, 2027
Maturity date		Sep. 07, 2028
Exit fee percentage		6.00%
2023 Notes \| On and prior to September 30, 2024
Debt Instrument [Line Items]
Interest rate paid in kind		6.00%
2023 Notes \| Beginning September 30, 2026
Debt Instrument [Line Items]
Periodic payment percentage of principal		1.50%
2023 Notes \| Minimum
Debt Instrument [Line Items]
Cash and/or certain permitted cash equivalent investments				$ 10,000,000
2023 Notes \| First Tranche
Debt Instrument [Line Items]
Principal amount		$ 30,000,000
First principal payment date		Sep. 07, 2023
2023 Notes \| Second Tranche
Debt Instrument [Line Items]
Principal amount		$ 15,000,000
First principal payment date		Jul. 31, 2024
2023 Notes \| Third Tranche
Debt Instrument [Line Items]
Principal amount		$ 20,000,000

FRACTYL HEALTH, INC. 10-K