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Stockholders' Equity (Narrative) (Options) (Details) (Stock Options [Member], USD $)
1 Months Ended 0 Months Ended 9 Months Ended
Dec. 31, 2014
Aug. 31, 2014
Employees
Jan. 23, 2015
Jul. 02, 2014
Mar. 31, 2015
Employees [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of summer employees to whom options are granted   2gltc_NumberOfIndividualsToWhomAwardsAreGranted
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
     
Expiration period 5 years 5 years      
Granted 215,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
1,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
     
Granted shares, exercise price $ 0.23us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
$ 0.66us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
     
Vesting percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
       
Vesting period 3 years        
Fair value $ 31,145gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
$ 682gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
     
Volatility rate 87.78%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
87.99%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
     
Expected term, simplified method 4 years 2.5 years      
Discount rate 1.31%gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsDiscountRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
0.63%gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsDiscountRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_EmployeesMember
     
Audit Committee Chairman [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period     10 years    
Granted     10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_AuditCommitteeChairmanMember
   
Granted shares, exercise price     $ 0.27us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_AuditCommitteeChairmanMember
   
Vesting period     3 years    
Fair value     1,974gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_AuditCommitteeChairmanMember
   
Volatility rate     84.16%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_AuditCommitteeChairmanMember
   
Expected term, simplified method     6.5 years    
Discount rate     1.61%gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsDiscountRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gltc_AuditCommitteeChairmanMember
   
Directors [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period       10 years  
Granted       470,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
 
Granted shares, exercise price       $ 0.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
 
Vesting period       1 year  
Fair value       $ 245,441gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
 
Volatility rate       88.55%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
 
Expected term, simplified method       5.5 years  
Discount rate       1.79%gltc_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsDiscountRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
 
Non-Employee, Non-Director Options [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted