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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair value of the company financial instruments that are required to be measured at fair value (Details) (USD $)
Mar. 31, 2015
Jun. 30, 2014
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Common stock warrant liability, warrants exercisable at $2.6058 from September 18, 2011 through September 18, 2016      
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Common stock warrant liability, warrants exercisable at $2.6058 from September 18, 2011 through September 18, 2016      
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Common stock warrant liability, warrants exercisable at $2.6058 from September 18, 2011 through September 18, 2016 1,240,996usat_CommonStockWarrantLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
585,209usat_CommonStockWarrantLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Total    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Common stock warrant liability, warrants exercisable at $2.6058 from September 18, 2011 through September 18, 2016 $ 1,240,996usat_CommonStockWarrantLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
$ 585,209usat_CommonStockWarrantLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember