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Net Loss Per Share Applicable to Common Stockholders (Tables)
 12 Months Ended
Apr. 30, 2017
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 years ended April 30, 2017, 2016 and 2015, respectively (in thousands, except net loss per share data):
 
Year Ended April 30,
 
2017
 
2016
 
2015
Net loss from continuing operations
$
(15,941
)
 
$
(25,339
)
 
$
(33,164
)
Net loss from discontinued operations, net of tax
—

 
—

 
(1,257
)
Net loss applicable to common stockholders
$
(15,941
)
 
$
(25,339
)
 
$
(34,421
)
Basic and diluted loss per share
 
 
 
 
 
Continuing operations
$
(0.19
)
 
$
(0.31
)
 
$
(0.42
)
Discontinued operations
—

 
—

 
(0.02
)
Basic and diluted loss per share
$
(0.19
)
 
$
(0.31
)
 
$
(0.44
)
Basic and diluted weighted average number of shares outstanding
83,051

 
80,859

 
78,645

Potentially dilutive securities (1):
 
 
 
 
 
Outstanding stock options
390

 
197

 
721

Restricted shares
857

 
49

 
427

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