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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 (Parentheticals) (unaudited) (Details) | Dec. 31, 2014 | Jun. 30, 2014
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Fair Value Disclosures [Abstract] |  |
Common stock warrant liability, warrants exercisable at through September 14, 2013, exercise price (in dollars per share) | 2.6058 usat_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsOne | 2.6058 usat_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsOne

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- Definition The exercise price of each class of warrants or rights outstanding. + References No definition available. + Details
Name: | usat_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsOne
Namespace Prefix: | usat_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration