Quarterly financial data (unaudited) (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	$ 35,351	$ 64,496	$ 73,875	$ 66,629	$ 51,703	$ 48,540	$ 50,160	$ 46,252	$ 240,351	$ 196,655	$ 191,234
Gross profit	15,016	28,973	40,153	29,778	22,451	21,091	21,254	18,710	113,920	83,506	76,504
Income (loss) from continuing operations	(9,249)	(733)	13,062	32	(9,915)	(5,534)	(4,118)	(6,085)	3,112	(25,652)	(37,430)
Loss on discontinued operations	0	0	(56)	(3,986)	(2,941)	(1,947)	(463)	(1,485)	(4,042)	(6,836)	(3,404)
Net loss	$ (9,249)	$ (733)	$ 13,006	$ (3,954)	$ (12,856)	$ (7,481)	$ (4,581)	$ (7,570)	$ (930)	$ (32,488)	$ (40,834)
Basic income (loss) per share:
Income (loss) from continuing operations (in dollars per share)	$ (0.20)	$ (0.02)	$ 0.27	$ 0.00	$ (0.21)	$ (0.12)	$ (0.09)	$ (0.14)	$ 0.07	$ (0.56)	$ (0.84)
Loss on discontinued operations (in dollars per share)	0	0	0	(0.08)	(0.06)	(0.04)	(0.01)	(0.03)	(0.08)	(0.15)	(0.08)
Net loss (in dollars per share)	(0.20)	(0.02)	0.27	(0.08)	(0.28)	(0.16)	(0.10)	(0.17)	(0.02)	(0.71)	(0.92)
Diluted income (loss) per share
Income (loss) from continuing operations (in dollars per share)	(0.20)	(0.02)	0.27	0.00	(0.21)	(0.12)	(0.09)	(0.14)	0.06	(0.56)	(0.84)
Loss on discontinued operations (in dollars per share)	0	0	0	(0.08)	(0.06)	(0.04)	(0.01)	(0.03)	(0.08)	(0.15)	(0.08)
Net loss (in dollars per share)	$ (0.20)	$ (0.02)	$ 0.27	$ (0.08)	$ (0.28)	$ (0.16)	$ (0.10)	$ (0.17)	$ (0.02)	$ (0.71)	$ (0.92)