Commitments and Contingencies (Details)	3 Months Ended
Mar. 31, 2023
Commitments and Contingencies [Abstract]
Contract cancelation notice period	30 days

Contract cancelation notice period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	galt_ContractCancelationNoticePeriod
Namespace Prefix:	galt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration