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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income (loss) available to common stockholders $ 27 $ (1,892) $ (501) $ (2,364)
Denominator:        
Common shares 89,987 88,557 89,171 88,397
Denominator for basic calculation 89,987 88,557 89,171 88,397
Employee stock options 1,717 0 0 0
Stock purchase rights 1,743 0 0 0
Denominator for diluted calculation 93,447 88,557 89,171 88,397
Net income (loss) per share:        
Basic $ 0.00 $ (0.02) $ (0.01) $ (0.03)
Diluted $ 0.00 $ (0.02) $ (0.01) $ (0.03)