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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Numerator and Denominator Used in Computation of Earnings Per Share
A summary of the numerator and denominators used in the computation of earnings per share is as follows:
 
Fiscal Year Ended
December 31,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Loss before income taxes
$
(21,799
)
 
$
(6,849
)
 
$
(12,969
)
Denominator:
 
 
 
 
 
Class A common stock
41,298

 
40,572

 
40,064

Class B common stock
988

 
988

 
988

Unvested restricted stock
(38
)
 
(88
)
 
(115
)
Effect of weighted average shares outstanding
(402
)
 
(239
)
 
(295
)
Weighted average common shares outstanding
41,846

 
41,233

 
40,642

Antidilutive potentially issuable shares
2,219

 
2,442

 
2,259