Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2022
Statement Of Stockholders Equity [Abstract]
Payment of sales commissions and other offering costs	$ 392	$ 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