ACQUISITION OF CANTALOUPE SYSTEMS, INC. - Pro forma results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Net loss per share:
Basic (in dollars per share)	$ (0.08)	$ (0.07)	$ (0.37)	$ (0.20)
Diluted (in dollars per share)	$ (0.08)	$ (0.07)	$ (0.37)	$ (0.20)
Weighted average number of common shares outstanding:
Basic (in shares)	60,065,053	53,637,085	60,059,594	51,101,813
Diluted (in shares)	60,065,053	53,637,085	60,059,594	51,101,813
Cantaloupe
Business Acquisition [Line Items]
Revenue		$ 33,592		$ 98,451
Net loss attributable to USAT		(1,895)		(6,254)
Net loss attributable to USAT common shares		$ (2,229)		$ (6,922)
Net loss per share:
Basic (in dollars per share)		$ (0.04)		$ (0.13)
Diluted (in dollars per share)		$ (0.04)		$ (0.13)
Weighted average number of common shares outstanding:
Basic (in shares)		53,637,085		53,601,684
Diluted (in shares)		53,637,085		53,601,684