v3.26.1

Organization and Operations - Additional Information (Details) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Feb. 17, 2026 USD ($)	Jun. 16, 2025 $ / shares shares	Feb. 28, 2026 USD ($)	Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Jun. 15, 2025 shares
Subsidiary, Sale of Stock [Line Items]
Net loss				$ (21,085)	$ (30,157)
Accumulated deficit				$ (283,137)	$ (262,052)
Reverse stock split ratio		0.05
Number of share issued and outstanding \| shares		20
Common stock, par value \| $ / shares		$ 0.0001		$ 0.0001	$ 0.0001
Common stock, shares authorized \| shares		12,500,000		12,500,000	12,500,000	250,000,000
Cash, cash equivalents and marketable securities				$ 21,100
Private Placement \| Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Gross proceeds	$ 200,000
Private Placement \| Series B Non-Voting Convertible Preferred Stock \| Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Gross proceeds			$ 200,000

Cash, cash equivalents, and marketable securities.

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Sensei Biotherapeutics, Inc. 10-K