SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jul. 01, 2018	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Line Items]
Cumulative effect of new accounting standard			$ 338
Decrease to accumulated deficit	$ (1,505)	$ (2,057)
Increase to stockholders' equity	26,126	25,174		$ 25,287	$ 23,843
Revenue recorded from bill and hold inventory	2,700	2,400
Bill and hold inventory	1,900	2,100
Contract asset	260	0
Contract liability	2,502	1,894
Contract liability, net of current portion	503	470
Capitalized contract cost, incremental costs to obtain contracts	59
Capitalized contract cost, amortization	10
Retained Earnings
Property, Plant and Equipment [Line Items]
Cumulative effect of new accounting standard			338
Increase to stockholders' equity	(1,505)	$ (2,057)		$ (1,385)	$ (92)
Adjustments | Accounting Standards Update 2014-09
Property, Plant and Equipment [Line Items]
Cumulative effect of new accounting standard			300
Decrease to accumulated deficit	(282)		300
Increase to stockholders' equity	(282)		300
Increase to contract asset			$ 300
Contract asset	(260)
Contract liability	(27)
Contract liability, net of current portion	$ 0