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COMMON STOCK, COMMON STOCK OPTIONS AND WARRANTS (Details Textuals 2) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Sep. 13, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to be issued as stock award 1,972,085us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized 2,090,226us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized  
Exercise price per share of authorized shares $ 1.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased $ 1.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased  
Number of warrants called to purchase common stock   58,527us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight 903,955us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Exercise price of warrants called to purchase common stock   $ 1.13us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 5.90us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Incentive stock options | Mr. Herbert      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to be issued as stock award 55,555us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= usat_IncentiveStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
   
Exercise price per share of authorized shares $ 1.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= usat_IncentiveStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
   
Incentive stock options | Mr. DeMedio      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to be issued as stock award 33,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= usat_IncentiveStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember
   
Exercise price per share of authorized shares $ 1.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= usat_IncentiveStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember
   
Non qualified stock options | Mr. Herbert      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to be issued as stock award 150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= usat_NonQualifiedStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
   
Exercise price per share of authorized shares $ 1.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= usat_NonQualifiedStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
   
Non qualified stock options | Mr. DeMedio      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to be issued as stock award 90,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= usat_NonQualifiedStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember
   
Exercise price per share of authorized shares $ 1.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= usat_NonQualifiedStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember