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6. Variable Interest Entity (Tables)
 3 Months Ended
Apr. 01, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Assets and liabilities of VIE
   April 1,
2017		   December 31,
2016		 
Assets          
Current assets  $307   $438 
Property and equipment, net   7,120    7,322 
Other assets   83    83 
Total assets  $7,510   $7,843 
Liabilities          
Accounts payable  $2,439   $1,388 
Accrued expenses   555    523 
Current maturities of long-term debt obligations   734    3,558 
Long-term debt obligations, net of current maturities   3,208    435 
Other liabilities   289    1,126 
Total liabilities  $7,225   $7,030 
Operating results of VIE
   Three Months Ended 
   April 1,
2017		   April 2,
2016		 
Revenues  $485   $1,715 
Gross profit   (117)   152 
Operating loss   (475)   (274)
Net loss   (511)   (358)