ACQUISITION OF CANTALOUPE SYSTEMS, INC. - Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ (0.18)	$ (0.08)	$ (0.29)	$ (0.13)
Diluted (in dollars per share)	$ (0.18)	$ (0.08)	$ (0.29)	$ (0.13)
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Basic (in shares)	60,059,936	52,150,106	60,056,924	49,861,735
Diluted (in shares)	60,059,936	52,150,106	60,056,924	49,861,735
Cantaloupe
Business Acquisition [Line Items]
Revenue		$ 33,970		$ 64,859
Net loss attributable to USAT		(2,339)		(4,359)
Net loss attributable to USAT common shares		$ (2,339)		$ (4,693)
Earnings Per Share [Abstract]
Basic (in dollars per share)		$ (0.04)		$ (0.09)
Diluted (in dollars per share)		$ (0.04)		$ (0.09)
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Basic (in shares)		53,619,921		53,584,368
Diluted (in shares)		53,619,921		53,584,368