Stock Incentive Plan and Employee Stock Purchase Plan - Schedule of Option Activity Under the Company's Incentive Plan (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Options Outstanding
Balance at the beginning of the year (in shares)	5,220	2,684	2,463
Options granted (in shares)	2,305	3,359	795
Options exercised (in shares)		(115)	(109)
Options forfeited/expired (in shares)	(1,569)	(708)	(465)
Balance at the end of the year (in shares)	5,956	5,220	2,684	2,463
Vested or Expected to vest at the end of the year (in shares)	5,222
Exercisable at the end of the year (in shares)	2,109
Weighted Average Exercise Price
Balance at the beginning of the year (in dollars per share)	$ 4.50	$ 5.26	$ 6.05
Options granted (in dollars per share)	2.64	4.09	4.12
Options exercised (in dollars per share)		4.26	4.02
Options forfeited/expired (in dollars per share)	4.36	5.51	7.76
Balance at the end of the year (in dollars per share)	3.82	$ 4.50	$ 5.26	$ 6.05
Vested or Expected to vest at the end of the year (in dollars per share)	3.90
Exercisable at the end of the year (in dollars per share)	$ 4.73
Weighted Average Remaining Contractual Life (In Years)
Balance	8 years 14 days	7 years 11 months 19 days	6 years 1 month 28 days	5 years 5 months 1 day
Vested or Expected to vest at the end of the year	7 years 10 months 24 days
Exercisable at the end of the year	6 years 5 months 19 days
Aggregate Intrinsic Value (in thousands)
Balance at the beginning of the year		$ 11	$ 60	$ 191