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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Numerator:    
Net income (loss) available to common stockholders $ (472) $ 8
Denominator:    
Common shares 88,233 88,592
Denominator for basic calculation 88,233 88,592
Employee stock options 0 2,480
Employee stock purchase rights 0 373
Denominator for diluted calculation 88,233 91,445
Net income (loss) per share:    
Basic $ (0.01) $ 0.00
Diluted $ (0.01) $ 0.00