Quarterly Financial Data (unaudited) (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
Quarterly Financial Data [Abstract]
Net revenue	$ 94,977	$ 99,548	$ 98,826	$ 89,577	$ 117,417	$ 103,221	$ 102,318	$ 95,829	$ 382,928	[1]	$ 418,785	[1]	$ 404,897	[1]
Gross profit	39,745	39,133	37,900	32,943	45,926	40,466	38,380	37,879	149,721		162,651		161,695
Net income (loss)	$ (152)	$ 2,625	$ 10,710	$ (9,356)	$ (1,400)	$ (1,184)	$ (4,640)	$ (9,206)	$ 3,827		$ (16,430)		$ (23,899)
Net income (loss) per share - basic	$ 0.00	$ 0.03	$ 0.12	$ (0.11)					$ 0.04		$ (0.19)		$ (0.28)
Net income (loss) per share - diluted	$ 0.00	$ 0.03	$ 0.12	$ (0.11)					$ 0.04		$ (0.19)		$ (0.28)
Weighted average common shares used in computing net income (loss) per share:
Basic	90,748	90,476	89,517	88,772					89,874		87,465		84,893
Diluted	90,748	90,855	90,279	88,772					90,623		87,465		84,893
Net loss per share—basic and diluted					$ (0.02)	$ (0.01)	$ (0.05)	$ (0.11)
Shares used in basic and diluted per share calculation					88,202	87,962	87,237	86,479

[1] Includes sales to the China joint venture, an equity method investment of $19,054 for the year ended June 30, 2020 and $0 for both years ended June 30, 2019 and June 30, 2018, respectively. See Note 13.