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Condensed Consolidated Statements of Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in-Capital [Member]
Accumulated Deficit [Member]
Non-Controlling Interest [Member]
Beginning balance at Dec. 31, 2017 $ 117,238 $ 318 $ (85,262) $ 421,657 $ (219,990) $ 515
Beginning balance, common shares at Dec. 31, 2017   24,999,688        
Cumulative impact | ASU 2014-09 (Topic 606) [Member] (690)       (690)  
Net income (loss) (2,388)       (2,554) 166
Stock-based compensation plans 6,744 $ 9   6,735    
Stock-based compensation plans, shares   925,375        
Repurchases of common stock (3,449)   (3,449)      
Repurchases of common stock, shares   (264,339)        
Distributions to non-controlling interest (256)         (256)
Treasury shares used for stock-based plans (116)   (116)      
Treasury shares used for stock-based plans, shares   (8,771)        
Stock-based compensation expense 2,251     2,251    
Ending balance at Jul. 01, 2018 119,334 $ 327 (88,827) 430,643 (223,234) 425
Ending balance, common shares at Jul. 01, 2018   25,651,953        
Beginning balance at Apr. 01, 2018 117,333 $ 321 (85,441) 424,771 (222,874) 556
Beginning balance, common shares at Apr. 01, 2018   25,286,229        
Net income (loss) (235)       (360) 125
Stock-based compensation plans 4,489 $ 6   4,483    
Stock-based compensation plans, shares   625,063        
Repurchases of common stock (3,386)   (3,386)      
Repurchases of common stock, shares   (259,339)        
Distributions to non-controlling interest (256)         (256)
Stock-based compensation expense 1,389     1,389    
Ending balance at Jul. 01, 2018 119,334 $ 327 (88,827) 430,643 (223,234) 425
Ending balance, common shares at Jul. 01, 2018   25,651,953        
Beginning balance at Dec. 30, 2018 $ 95,533 $ 330 (108,372) 432,771 (229,558) 362
Beginning balance, common shares at Dec. 30, 2018 24,142,586 24,142,586        
Cumulative impact | ASU 2016-02 (Topic 842) [Member] $ (531)       (531)  
Net income (loss) (20,123)       (20,305) 182
Stock-based compensation plans 173 $ 1   172    
Stock-based compensation plans, shares   116,367        
Repurchases of common stock (3,467)   (3,467)      
Repurchases of common stock, shares   (485,659)        
Distributions to non-controlling interest (177)         (177)
Contributions from non-controlling interest 39         39
Treasury shares used for stock-based plans (35)   (35)      
Treasury shares used for stock-based plans, shares   (4,919)        
Stock-based compensation expense 1,464     1,464    
Ending balance at Jun. 30, 2019 $ 72,876 $ 331 (111,874) 434,407 (250,394) 406
Ending balance, common shares at Jun. 30, 2019 23,768,375 23,768,375        
Beginning balance at Mar. 31, 2019 $ 76,088 $ 330 (109,541) 433,400 (248,528) 427
Beginning balance, common shares at Mar. 31, 2019   24,038,211        
Net income (loss) (1,749)       (1,866) 117
Stock-based compensation plans 3 $ 1   2    
Stock-based compensation plans, shares   82,694        
Repurchases of common stock (2,323)   (2,323)      
Repurchases of common stock, shares   (350,659)        
Distributions to non-controlling interest (177)         (177)
Contributions from non-controlling interest 39         39
Treasury shares used for stock-based plans (10)   (10)      
Treasury shares used for stock-based plans, shares   (1,871)        
Stock-based compensation expense 1,005     1,005    
Ending balance at Jun. 30, 2019 $ 72,876 $ 331 $ (111,874) $ 434,407 $ (250,394) $ 406
Ending balance, common shares at Jun. 30, 2019 23,768,375 23,768,375