Net income (loss) per share - Calculation of basic and diluted net income (loss) per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
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)
Shares used to compute basic income (loss) per share (in shares)									47,868	45,577	44,498
Dilutive potential common shares
Shares used to compute diluted income per share (in shares)									48,761	45,577	44,498
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)
Stock options
Dilutive potential common shares
Dilutive potential common shares (in shares)									29	0	0
Restricted stock units
Dilutive potential common shares
Dilutive potential common shares (in shares)									864	0	0