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WARRANTS - Summary of warrant activity (Details 1) - Warrants - shares | 12 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Class Of Warrant Or Right [Roll Forward] |  |  |
Outstanding at June 30 | 4,309,000 | 4,309,000 | 7,361,708
Issued | 23,978 |  |
Exercised | (1,887,325) |  | (2,090,226)
Expired |  |  | (962,482)
Outstanding at June 30 | 2,445,653 | 4,309,000 | 4,309,000

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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of warrants or rights exercised. + References No definition available. + Details
Name: | usat_ClassOfWarrantOrRightExercised
Namespace Prefix: | usat_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of warrants or rights expired. + References No definition available. + Details
Name: | usat_ClassOfWarrantOrRightExpired
Namespace Prefix: | usat_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of warrants or rights issued. + References No definition available. + Details
Name: | usat_ClassOfWarrantOrRightIssued
Namespace Prefix: | usat_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | usat_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |