Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Underwritten Public Offering
Underwriting discounts and commissions and other offering costs	$ 14,323	$ 5,024	$ 14,323	$ 5,024

Underwriting discounts and commissions and other offering costs.

No definition available.

Name:	tsha_UnderwritingDiscountsAndCommissionsAndOtherOfferingCosts
Namespace Prefix:	tsha_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration