Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net loss available to common stockholders	$ (546)	$ 27	$ (2,715)	$ (501)
Denominator:
Common shares	91,689	89,987	91,667	89,171
Denominator for basic calculation	91,689	89,987	91,667	89,171
Employee stock options	0	1,717	0	0
Stock purchase rights	0	1,743	0	0
Denominator for diluted calculation	91,689	93,447	91,667	89,171
Net loss per share:
Basic	$ (0.01)	$ 0.00	$ (0.03)	$ (0.01)
Diluted	$ (0.01)	$ 0.00	$ (0.03)	$ (0.01)