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Earnings Per Share
 12 Months Ended
Jan. 01, 2019
Earnings Per Share [Abstract]  
Earnings Per Share Loss Per Share
Basic earnings (loss) per share (“EPS”) is calculated by dividing net income (loss) available to common shareholders by the weighted-average number of shares of common stock outstanding during each period. Diluted EPS is calculated using net income (loss) available to common stockholders divided by diluted weighted-average shares of common stock outstanding during each period. Potentially dilutive securities include shares of common stock underlying stock options and restricted common stock. Diluted EPS considers the impact of potentially dilutive securities except in periods in which there is a loss because the inclusion of the potential common shares would have an anti-dilutive effect.
The following table sets forth the computations of basic and diluted EPS (in thousands, except share and per share data):
 
 
2018
 
2017
 
2016
Net loss attributable to common stockholders
 
$
(8,441
)
 
$
(45,449
)
 
$
(71,677
)
Shares:
 
 
 
 
 
 
Basic weighted average shares outstanding
 
42,329,556

 
37,759,497

 
27,808,708

Effect of dilutive securities
 
—

 
—

 
—

Diluted weighted average number of shares outstanding
 
42,329,556

 
37,759,497

 
27,808,708

Loss per share:
 
 
 
 
 
 
Basic loss earnings per share
 
$
(0.20
)
 
$
(1.20
)
 
$
(2.58
)
Diluted loss earnings per share
 
$
(0.20
)
 
$
(1.20
)
 
$
(2.58
)

The Company computes the effect of dilutive securities using the treasury stock method and average market prices during the period. Potential common shares are excluded from the computation of diluted earnings per share when the effect would be anti-dilutive. Shares issuable on the vesting or exercise of share based awards or exercise of outstanding warrants, and the shares underlying the 18,500 shares of convertible preferred stock outstanding in the first quarter of 2017, were excluded from the calculation of diluted loss per share because the effect of their inclusion would have been anti-dilutive totaled 2,829,630, 4,154,778 and 2,697,697 for 2018, 2017 and 2016, respectively.