SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Impact of New Accounting Guidance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jul. 01, 2018	Jun. 30, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Current contract asset	$ 260				$ 0				$ 260	$ 0
Prepaid and other current assets	922				739				922	739
Total current assets	18,753				16,250				18,753	16,250
Total assets	36,040				33,231				36,040	33,231
Contract liability	2,502				1,894				2,502	1,894
Total current liabilities	8,178				5,992				8,178	5,992
CONTRACT LIABILITY, net of current portion	503				470				503	470
Total liabilities	9,914				8,057				9,914	8,057
Accumulated deficit	(1,505)				(2,057)				(1,505)	(2,057)
Total stockholders' equity	26,126				25,174				26,126	25,174	$ 25,287		$ 23,843
Total liabilities and stockholders' equity	36,040				33,231				36,040	33,231
Revenues									44,312	40,141	38,188
Cost of revenues									31,042	28,739	26,351
Gross profits	3,892	$ 2,035	$ 3,991	$ 3,352	2,947	$ 2,296	$ 3,131	$ 3,028	13,270	11,402	11,837
Selling, general and administrative									12,003	11,168	12,223
Operating income	568	(1,073)	827	125	(78)	(707)	107	101	447	(577)	(1,187)
Net income	490	$ (1,125)	$ 779	$ 70	$ (146)	$ (757)	$ 156	$ 75	214	$ (672)	$ (1,293)
Adjustments | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Current contract asset	(260)								(260)
Prepaid and other current assets	(49)								(49)
Total current assets	(309)								(309)
Total assets	(309)								(309)
Contract liability	(27)								(27)
Total current liabilities	(27)								(27)
CONTRACT LIABILITY, net of current portion	0								0
Total liabilities	(27)								(27)
Accumulated deficit	(282)								(282)			$ 300
Total stockholders' equity	(282)								(282)			$ 300
Total liabilities and stockholders' equity	(309)								(309)
Revenues									267
Cost of revenues									162
Gross profits									105
Selling, general and administrative									49
Operating income									56
Net income									56
Balance Without Adoption
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Current contract asset	0								0
Prepaid and other current assets	873								873
Total current assets	18,444								18,444
Total assets	35,731								35,731
Contract liability	2,475								2,475
Total current liabilities	8,151								8,151
CONTRACT LIABILITY, net of current portion	503								503
Total liabilities	9,887								9,887
Accumulated deficit	(1,787)								(1,787)
Total stockholders' equity	25,844								25,844
Total liabilities and stockholders' equity	$ 35,731								35,731
Revenues									44,579
Cost of revenues									31,204
Gross profits									13,375
Selling, general and administrative									12,052
Operating income									503
Net income									$ 270