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Net Loss Per Share Applicable to Common Stockholders (Tables)
 3 Months Ended
Jul. 31, 2016
Earnings Per Share [Abstract]  
Computations of Loss per Share Applicable to Common Stockholders
The following table sets forth the computations of net loss per share applicable to common stockholders for the three months ended July 31, 2016 and 2015, respectively (in thousands, except net loss per share data):
 
Three Months Ended July 31,
 
2016
 
2015
Net loss
$
(5,105
)
 
$
(10,244
)
Basic and diluted loss per share
$
(0.06
)
 
$
(0.13
)
Basic and diluted weighted average number of shares outstanding
82,214

 
80,174

Potentially dilutive securities (1):
 
 
 
Outstanding stock options
132

 
324

Restricted shares
47

 
58

(1)
The impact of potentially dilutive securities on earnings per share is anti-dilutive in a period of net loss.