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FAIR VALUE OF FINANCIAL INSTRUMENTS - Changes in fair value of the Company level 3 financial instruments (unaudited) (Details 1) (USD $)	6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (585,209)usat_WarrantLiabilitiesNoncurrent	$ (650,638)usat_WarrantLiabilitiesNoncurrent
Gain due to change in fair value of warrant liabilities, net	445,454us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	181,201us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Ending balance	$ (139,755)usat_WarrantLiabilitiesNoncurrent	$ (469,437)usat_WarrantLiabilitiesNoncurrent

X

- Definition

The noncurrent portion (due beyond one year or one operating cycle) of warrant liabilities not otherwise defined in the taxonomy.

+ References

No definition available.

+ Details

Name:	usat_WarrantLiabilitiesNoncurrent
Namespace Prefix:	usat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration