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Net Loss per Common Share
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Net Loss per Common Share
Net Loss per Common Share
Basic loss per share is based upon the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. Diluted loss per share is based upon the weighted-average number of common shares outstanding during the period plus additional weighted-average potentially dilutive common stock equivalents during the period when the effect is dilutive.
The following table presents the computation of basic and diluted loss per common share (in thousands, except share and per share data):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
 
2017
 
2016
 
2017
 
2016
 
Loss attributable to common stockholders
 
$
(16,726
)
 
$
(32,389
)
 
$
(37,639
)
 
$
(56,109
)
 
 
 
 
 
 
 
 
 
 
 
Basic and diluted weighted-average shares outstanding
 
29,225,386

 
28,891,827

 
29,219,469

 
28,874,385

 
 
 
 
 
 
 
 
 
 
 
Basic and diluted loss per share
 
$
(0.57
)
 
$
(1.12
)
 
$
(1.29
)
 
$
(1.94
)
 


All common stock equivalents are excluded from the computation of diluted loss per share during periods in which losses are reported since the result would be anti-dilutive. As of June 30, 2017, anti-dilutive stock options and restricted stock awards excluded from our calculation totaled 7,667,926 and 196,209, respectively. As of June 30, 2016, anti-dilutive stock options and restricted stock awards excluded from our calculation totaled 6,118,265 and 367,031, respectively.