Net Income (Loss) Per Common Share - Schedule of reconciliation of the numerator and denominator used in the calculation of basic and diluted net income (loss) per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income (loss)	$ 10,710	$ (9,356)	$ (4,640)	$ (9,206)	$ 1,354	$ (13,846)
Weighted average common shares used in computing net loss per share:
Weighted average shares outstanding - basic	89,517		87,237		89,145	86,858
Dilutive effect of potential common shares	762				950
Weighted average shares outstanding - diluted	90,279		87,237		90,095	86,858
Basic net income (loss) per share	$ 0.12		$ (0.05)		$ 0.02	$ (0.16)
Diluted net income (loss) per share	$ 0.12		$ (0.05)		$ 0.02	$ (0.16)