UNAUDITED QUARTERLY DATA - Quarterly Data (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 32,645	$ 43,098	$ 44,051	$ 43,359	$ 38,508	$ 37,704	$ 34,486	$ 33,768	$ 163,153	$ 144,466	$ 132,508
Gross profit	11,097	10,998	12,762	11,416	9,739	9,953	9,435	11,058	46,273	40,185	35,676
Operating loss	(10,380)	(10,178)	(7,756)	(11,278)	(9,484)	(3,718)	(10,008)	(4,973)	(39,592)	(28,183)	(9,223)
Net loss	(11,414)	(9,295)	(8,378)	(11,508)	(9,850)	(4,306)	(10,438)	(5,288)	(40,595)	(29,882)	(11,284)
Cumulative preferred dividends	0	(334)	0	(334)	0	(334)	0	(334)	(668)	(668)	(668)
Net loss available to common shares	$ (11,414)	$ (9,629)	$ (8,378)	$ (11,842)	$ (9,850)	$ (4,640)	$ (10,438)	$ (5,622)	$ (41,263)	$ (30,550)	$ (11,952)
Net loss per common share - basic (in USD per share)	$ (0.18)	$ (0.15)	$ (0.13)	$ (0.20)	$ (0.16)	$ (0.08)	$ (0.17)	$ (0.09)	$ (0.66)	$ (0.51)	$ (0.23)
Net loss per common share - diluted (in USD per share)	$ (0.18)	$ (0.15)	$ (0.13)	$ (0.20)	$ (0.16)	$ (0.08)	$ (0.17)	$ (0.09)	$ (0.66)	$ (0.51)	$ (0.23)
Weighted average number of common shares outstanding - basic (in shares)	64,154,252	64,096,778	63,664,256	60,096,852	60,065,978	60,065,053	60,059,936	60,053,912	62,980,193	60,061,243	51,840,518
Weighted average number of common shares outstanding - diluted (in shares)	64,154,252	64,096,778	63,664,256	60,096,852	60,065,978	60,065,053	60,059,936	60,053,912	62,980,193	60,061,243	51,840,518