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Stockholders' Equity (Narrative) (Warrant) (Details) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Mar. 17, 2015
Jan. 23, 2015
Dec. 31, 2014
Sep. 30, 2014
Feb. 12, 2015
President and principal shareholder [Member] | Secured convertible line of credit agreement [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term 2 years            
Number of shares callable by warrants 1,202,814us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_TypeOfArrangementAxis
= gltc_SecuredConvertibleLineOfCreditAgreementMember
1,202,814us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_TypeOfArrangementAxis
= gltc_SecuredConvertibleLineOfCreditAgreementMember
         
Warrant exercise price $ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_TypeOfArrangementAxis
= gltc_SecuredConvertibleLineOfCreditAgreementMember
$ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_TypeOfArrangementAxis
= gltc_SecuredConvertibleLineOfCreditAgreementMember
        $ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_TypeOfArrangementAxis
= gltc_SecuredConvertibleLineOfCreditAgreementMember
Expected term, simplified method   2 years          
President and principal shareholder [Member] | Minimum [Member] | Secured convertible line of credit agreement [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Volatility rate   80.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_TypeOfArrangementAxis
= gltc_SecuredConvertibleLineOfCreditAgreementMember
         
Discount rate   0.58%gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_TypeOfArrangementAxis
= gltc_SecuredConvertibleLineOfCreditAgreementMember
         
President and principal shareholder [Member] | Maximum [Member] | Secured convertible line of credit agreement [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Volatility rate   87.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_TypeOfArrangementAxis
= gltc_SecuredConvertibleLineOfCreditAgreementMember
         
Discount rate   0.70%gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_TypeOfArrangementAxis
= gltc_SecuredConvertibleLineOfCreditAgreementMember
         
Consultant services [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term     5 years        
Number of shares callable by warrants     10,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_ConsultantServiceMember
       
Warrant exercise price     $ 0.25us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_ConsultantServiceMember
       
Fair value     $ 1,667gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsFairValue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_ConsultantServiceMember
       
Volatility rate     84.08%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_ConsultantServiceMember
       
Expected term, simplified method     5 years        
Discount rate     1.61%gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsDiscountRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_ConsultantServiceMember
       
Legal Services [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term       5 years      
Number of shares callable by warrants       100,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_LegalServicesMember
     
Warrant exercise price       $ 0.27us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_LegalServicesMember
     
Fair value       $ 17,611gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsFairValue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_LegalServicesMember
     
Volatility rate       81.85%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_LegalServicesMember
     
Expected term, simplified method       5 years      
Discount rate       1.39%gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsDiscountRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_LegalServicesMember
     
Private Placement [Member] | President and principal shareholder [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term 2 years            
Number of shares callable by warrants 326,087us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember
326,087us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember
    457,984us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember
976,614us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember
 
Warrant exercise price $ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember
$ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PresidentMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember
         
Private Placement [Member] | Accredited Investors [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term         2 years 2 years  
Number of shares callable by warrants         1,762,635us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_InvestorOneMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember
1,081,656us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_InvestorOneMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember
 
Warrant exercise price         $ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_InvestorOneMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember
$ 2.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_InvestorOneMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PrivatePlacementMember