LEASES - Narrative (Details)	Dec. 31, 2025
Leases [Abstract]
Annual rent increase percentage	2.50%

The percentage of annual rent increase during the period.

No definition available.

Name:	tls_AnnualRentIncreasePercentage
Namespace Prefix:	tls_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant