Quarterly Financial Data (unaudited) - Schedule of Selected Quarterly Financial Data (Detail) - 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 Information Disclosure [Abstract]
Revenues	$ 110,639	$ 111,715	$ 111,691	$ 108,176	$ 108,241	$ 106,438	$ 104,846	$ 102,437	$ 442,221	$ 421,962	$ 394,096
Gross profit	63,016	63,786	64,652	61,681	61,346	60,725	59,865	57,307	253,135	239,243	220,654
Net (loss) income	$ (3,003)	$ (7,468)	$ 2,609	$ (1,367)	$ 3,557	$ 824	$ 5,969	$ (918)	$ (9,229)	$ 9,432	$ 9,328
Basic net (loss) income per share (in dollars per share)	$ (0.07)	$ (0.18)	$ 0.06	$ (0.03)	$ 0.09	$ 0.02	$ 0.15	$ (0.02)
Diluted net (loss) income per share (in dollars per share)	$ (0.07)	$ (0.18)	$ 0.06	$ (0.03)	$ 0.09	$ 0.02	$ 0.14	$ (0.02)
Shares used in computing basic net (loss) income per share (in shares)	42,078	41,823	41,693	41,487	41,214	40,911	40,635	39,689	41,770	40,612	38,227
Shares used in computing diluted net (loss) income per share (in shares)	42,078	41,823	42,092	41,487	41,813	41,625	41,739	39,689	41,770	41,691	39,326
Liquidated investment					$ 400					$ 400	$ 3,000
Gain (loss) on sale of equity investments										$ 7,300	$ 2,400