Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) $ in Thousands	9 Months Ended
Sep. 30, 2022 USD ($)
Statement Of Stockholders Equity [Abstract]
Payment of sales commissions and other offering costs	$ 392

Payment of sales commissions and other offering costs.

No definition available.

Name:	tsha_PaymentOfSalesCommissionsAndOtherOfferingCosts
Namespace Prefix:	tsha_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration