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Commitments and Contingencies (Details) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2012
Mar. 31, 2015
Mar. 31, 2014
Nov. 30, 2012
Jul. 31, 2012
Oct. 28, 2014
Jan. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Loss Contingencies [Line Items]                      
Other income $ 200us-gaap_OtherOperatingIncome    $ 200,000us-gaap_OtherOperatingIncome $ 448,622us-gaap_OtherOperatingIncome $ 17,000us-gaap_OtherOperatingIncome            
Loss Contingency Invasion Of Privacy And Misrepresentation [Member]                      
Loss Contingencies [Line Items]                      
Litigation accrual                     1,646,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyInvasionOfPrivacyAndMisrepresentationMember
Litigation, provision             200,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyInvasionOfPrivacyAndMisrepresentationMember
       
Damages paid to plaintiff by insurance carrier           200,000us-gaap_LossContingencyDamagesPaidValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyInvasionOfPrivacyAndMisrepresentationMember
         
Loss Contingency Breach Of Agreement [Member]                      
Loss Contingencies [Line Items]                      
Litigation accrual               56,956us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyBreachOfAgreementMember
     
Litigation, provision             841,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyBreachOfAgreementMember
  500,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyBreachOfAgreementMember
   
Other income               448,044us-gaap_OtherOperatingIncome
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyBreachOfAgreementMember
     
Damages awarded               51,956us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyBreachOfAgreementMember
     
Loss Contingency Trespass Claim [Member]                      
Loss Contingencies [Line Items]                      
Litigation, provision             5,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyTrespassClaimMember
       
Loss Contingency Civil Theft [Member]                      
Loss Contingencies [Line Items]                      
Litigation, provision             200,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyCivilTheftMember
       
Loss Contingency Civil Theft Law Enforced Settlement [Member]                      
Loss Contingencies [Line Items]                      
Litigation, provision             600,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyCivilTheftLawEnforcedSettlementMember
       
Portion of litigation expense that was dismissed                 200,000gltc_LitigationDismissed
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyCivilTheftLawEnforcedSettlementMember
   
Other income                   $ 941,000us-gaap_OtherOperatingIncome
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gltc_LossContingencyCivilTheftLawEnforcedSettlementMember