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Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) 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

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- 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

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- 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 http://asc.fasb.org/extlink&oid=123398962&loc=d3e400-110220 + Details
Name: | us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwillAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration