Contract liabilities, Grand pharma strategic partnership (Details)	Nov. 02, 2020 USD ($)
Grand Pharmaceutical Group Limited [Member]
Grand Pharma strategic partnership [Abstract]
Non-refundable upfront payment received	$ 25,000,000

The amount of the non-refundable upfront payment received.

No definition available.

Name:	tlx_NonRefundableUpfrontPaymentReceived
Namespace Prefix:	tlx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration