Share-Based Compensation - Narrative (Details) $ in Thousands	12 Months Ended
Dec. 31, 2023 USD ($) employee shares
Share-Based Payment Arrangement [Abstract]
Shares modified (in shares) \| shares	186,600
Number of terminated employee \| employee	1
Incremental stock-based compensation expense \| $	$ 258

Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Modified

No definition available.

Name:	lsta_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesModified
Namespace Prefix:	lsta_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration