Stock-based compensation - Summary of stock option activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
Number of Shares
Beginning balance (shares) | shares	1,638
Granted (shares) | shares	0
Exercised (shares) | shares	(14)
Canceled or expired (shares) | shares	(9)
Ending balance (shares) | shares	1,615
Options vested and expected to vest (shares) | shares	1,603
Options exercisable (shares) | shares	1,468
Weighted Average Exercise Price
Weighted average exercise (in dollars per share) | $ / shares	$ 6.55
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	4.92
Canceled or expired (in dollars per share) | $ / shares	5.56
Weighted average exercise (in dollars per share) | $ / shares	6.56
Options vested and expected to vest (in dollars per share) | $ / shares	6.58
Options exercisable (in dollars per share) | $ / shares	$ 6.70
Weighted Average Remaining Contractual Life
Options outstanding	4 years 11 months 12 days
Options vested and expected to vest	4 years 11 months 1 day
Options exercisable	4 years 7 months 20 days
Aggregate Intrinsic Value
Options outstanding | $	$ 0
Options vested and expected to vest | $	0
Options exercisable | $	$ 0