CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (31,091)	$ (7,314)	$ (7,195)
Other comprehensive income (loss):
Net unrealized gain (loss) on investments in available-for-sale securities, before tax	2,094	679	(177)
Income tax		(176)
Comprehensive loss	$ (28,997)	$ (6,811)	$ (7,372)