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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 $) | Dec. 31, 2014 | Jun. 30, 2014
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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 | 139,755 usat_CommonStockWarrantLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 585,209 usat_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 | $ 139,755 usat_CommonStockWarrantLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 585,209 usat_CommonStockWarrantLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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