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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Numerator:        
Net income (loss) available to common stockholders $ (1,680) $ 444 $ (4,044) $ 1,743
Denominator:        
Common shares 88,289 89,594 88,812 89,107
Denominator for basic calculation 88,289 89,594 88,812 89,107
Employee stock options 0 1,963 0 2,210
Stock purchase rights 0 417 0 435
Denominator for diluted calculation 88,289 91,974 88,812 91,752
Net income (loss) per share:        
Basic $ (0.02) $ 0.01 $ (0.05) $ 0.02
Diluted $ (0.02) $ 0.01 $ (0.05) $ 0.02