XML 76 R61.htm IDEA: XBRL DOCUMENT
v3.25.1

Stock-Based Compensation, Deferred Stock Units (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Restricted Stock Grants [Abstract] |  |  |  |
Unrecognized compensation cost | $ 775,000 |  |  |
Chief Executive Officer [Member] |  |  |  |
Restricted Stock Grants [Abstract] |  |  |  |
Stock based compensation expense |  | $ 459,000 | $ 418,000 |
Unrecognized compensation cost | $ 0 |  |  |
Chief Executive Officer [Member] | Deferred Bonus [Member] |  |  |  |
Restricted Stock Grants [Abstract] |  |  |  |
Percentage of base salary paid in cash |  | 20.00% | 20.00% |
Percentage of base salary paid in deferred stock units |  | 80.00% | 80.00% |
Percentage of DSUs shall be credited on March 1, 2023 |  |  | 25.00% |
Percentage of DSUs shall be credited on March 1, 2024 |  |  | 50.00% |
Percentage of DSUs shall be credited on September 1, 2028 |  |  | 25.00% |
Percentage of DSUs shall be credited on March 1, 2024 | 50.00% |  |  |
Percentage of DSUs shall be credited on March 1, 2023 |  | 25.00% |  |
Shares unissued (in shares) | 367,800 | 183,900 |  |
Shares withheld to cover income tax withholding (in shares) | 153,288 | 75,529 |  |
Income tax payment withholding | $ 300,445 | $ 156,345 |  |
Shares issued (in shares) | 214,512 | 108,371 |  |
Percentage of DSUs shall be credited on March 1, 2025 |  | 50.00% |  |
Percentage of DSUs shall be credited on January 5, 2026 |  | 50.00% |  |
Common stock reserved for future issuance (in shares) |  | 275,126 | 268,596 |
Common Stock Weighted average Grant Date fair Value (in dollars per share) |  | $ 1.71 | $ 1.56 |
Chief Executive Officer [Member] | Bonus Shares [Member] |  |  |  |
Restricted Stock Grants [Abstract] |  |  |  |
Stock based compensation expense |  |  | $ 210,000 | $ 200,000
Common stock reserved for future issuance (in shares) |  |  | 143,836 | 103,627
Common Stock Weighted average Grant Date fair Value (in dollars per share) |  |  | $ 1.46 | $ 1.93
Reclassification of accrued compensation to additional paid in capital |  | $ 210,000 | $ 200,000 |

X
- Definition Percentage of underlying the outstanding whole number of DSUs credited individuals during period. + References No definition available. + Details
Name: | galt_DeferredCompensationArrangementPercentageOfDeferredShareUnitsShallBeIssuedPeriodFive
Namespace Prefix: | galt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of underlying the outstanding whole number of DSUs credited individuals during period. + References No definition available. + Details
Name: | galt_DeferredCompensationArrangementPercentageOfDeferredShareUnitsShallBeIssuedPeriodFour
Namespace Prefix: | galt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of underlying the outstanding whole number of DSUs credited individuals during period. + References No definition available. + Details
Name: | galt_DeferredCompensationArrangementPercentageOfDeferredShareUnitsShallBeIssuedPeriodOne
Namespace Prefix: | galt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of underlying the outstanding whole number of DSUs credited individuals during period. + References No definition available. + Details
Name: | galt_DeferredCompensationArrangementPercentageOfDeferredShareUnitsShallBeIssuedPeriodSeven
Namespace Prefix: | galt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of underlying the outstanding whole number of DSUs credited individuals during period. + References No definition available. + Details
Name: | galt_DeferredCompensationArrangementPercentageOfDeferredShareUnitsShallBeIssuedPeriodSix
Namespace Prefix: | galt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of underlying the outstanding whole number of DSUs credited individuals during period. + References No definition available. + Details
Name: | galt_DeferredCompensationArrangementPercentageOfDeferredShareUnitsShallBeIssuedPeriodThree
Namespace Prefix: | galt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of underlying the outstanding whole number of DSUs credited individuals during period. + References No definition available. + Details
Name: | galt_DeferredCompensationArrangementPercentageOfDeferredShareUnitsShallBeIssuedPeriodTwo
Namespace Prefix: | galt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The deferred compensation arrangement with individual cash award granted paid in cash percentage. + References No definition available. + Details
Name: | galt_DeferredCompensationArrangementWithIndividualCashAwardGrantedPaidInCashPercent
Namespace Prefix: | galt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The deferred compensation arrangement with individual cash award granted paid in deferred stock units percentage. + References No definition available. + Details
Name: | galt_DeferredCompensationArrangementWithIndividualCashAwardGrantedPaidInDeferredStockUnitsPercent
Namespace Prefix: | galt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | galt_RestrictedStockGrantsAbstract
Namespace Prefix: | galt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase to additional paid-in capital (APIC) for recognition of cost for option under share-based payment arrangement. + References No definition available. + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockSharesSubscribedButUnissued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans). + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The per share price that the individual must pay to acquire shares under the deferred compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued pursuant to the terms of a deferred compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
Name: | us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis=us-gaap_DeferredBonusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis=galt_BonusSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |