SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Revenue by Solution (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 12,568	$ 10,414	$ 14,565	$ 13,599	$ 12,174	$ 9,451	$ 12,394	$ 10,293	$ 51,146	$ 44,312	$ 40,141
Revenue Percentage									100.00%	100.00%	100.00%
Mailbacks
Disaggregation of Revenue [Line Items]
Total revenues									$ 26,578	$ 24,501	$ 22,272
Revenue Percentage									52.00%	55.20%	55.50%
Route-based pickup services
Disaggregation of Revenue [Line Items]
Total revenues									$ 10,390	$ 9,029	$ 7,492
Revenue Percentage									20.30%	20.40%	18.70%
Unused medications
Disaggregation of Revenue [Line Items]
Total revenues									$ 9,163	$ 6,936	$ 5,907
Revenue Percentage									17.90%	15.70%	14.70%
Third party treatment services
Disaggregation of Revenue [Line Items]
Total revenues									$ 247	$ 290	$ 891
Revenue Percentage									0.50%	0.70%	2.20%
Other
Disaggregation of Revenue [Line Items]
Total revenues									$ 4,768	$ 3,556	$ 3,579
Revenue Percentage									9.30%	8.00%	8.90%