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Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($) item
Impairment of Long-Lived Assets
Number of long-lived assets determined to be impaired | item	0	0
Assets held for sale | $	$ 0.0	$ 0.0

X

- Definition

Represents the number of long-lived assets determined to be impaired.

+ References

No definition available.

+ Details

Name:	glyc_NumberOfLongLivedAssetsDeterminedToBeImpaired
Namespace Prefix:	glyc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=126982154&loc=d3e400-110220

+ Details

Name:	us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwillAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration