Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 625	$ 605
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares	200,000,000	200,000,000
Common stock, issued shares	88,578,510	88,578,510
Common stock, outstanding shares	88,521,511	88,521,511
Accounts receivable from joint venture	$ 3,438	$ 0