Note 11. Loss Per Share

The calculation of basic and diluted loss per share was as follows:

	Three Months Ended April 30,						Six Months Ended April 30,
	2017			2016			2017			2016
Numerator
Net loss	$	(13,238	)	$	(15,414	)	$	(26,923	)	$	(27,193	)
Net loss attributable to noncontrolling interest		—			41			—			108
Preferred stock dividend		(800	)		(800	)		(1,600	)		(1,600	)
Net loss attributable to common shareholders	$	(14,038	)	$	(16,173	)	$	(28,523	)	$	(28,685	)
Denominator
Weighted average basic common shares		42,568,818			28,782,066			40,049,948			27,500,236
Effect of dilutive securities ⁽¹⁾		—			—			—			—
Weighted average diluted common shares		42,568,818			28,782,066			40,049,948			27,500,236
Basic loss per share	$	(0.33	)	$	(0.56	)	$	(0.71	)	$	(1.04	)
Diluted loss per share (1)	$	(0.33	)	$	(0.56	)	$	(0.71	)	$	(1.04	)

(1)

Due to the net loss to common shareholders in each of the periods presented above, diluted loss per share was computed without consideration to potentially dilutive instruments as their inclusion would have been antidilutive. As of April 30, 2017 and 2016, potentially dilutive securities excluded from the diluted loss per share calculation are as follows:

	April 30, 2017		April 30, 2016
July 2016 Offering - Series A Warrants		7,680,000		—
July 2014 Offering - NRG Warrants		166,666		166,666
Outstanding options to purchase common stock		214,383		251,653
Unvested Restricted Stock Awards		1,986,732		908,595
5% Series B Cumulative Convertible Preferred Stock		454,043		454,043
Series 1 Preferred Shares to satisfy conversion requirements		15,166		15,166
Total potentially dilutive securities		10,516,990		1,796,123

Refer to Note 12, Redeemable Preferred Stock, which is included in our Annual Report on Form 10-K for the year ended October 31, 2016 for information on the calculation of the common shares upon conversion.