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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Dec. 31, 2016
Jun. 30, 2018
Dec. 30, 2017
Jul. 01, 2017
Cash flows from operating activities:                  
Net loss $ (3,417) $ (3,847) $ (8,090) $ (7,189) $ 13,400 $ 11,200      
Adjustments to reconcile net loss to net cash used in operating activities:                  
Depreciation and amortization     132 144          
Interest accrued on convertible promissory note     150 150          
Amortization of debt discount     107 108          
Stock-based compensation 173 381 414 645          
Issuance of warrant in lieu of payment     12            
Changes in operating assets and liabilities:                  
Accounts receivable     166 (68)          
Inventories     640 (1,748)          
Prepaid expenses and other assets     76 122          
Accounts payable     685 2,620          
Accrued payroll and related liabilities     (212) (296)          
Accrued expenses and other liabilities     27 2          
Net cash used in operating activities     (5,893) (5,510)          
Cash flows from investing activities:                  
Acquisition of property and equipment     (37) (53)          
Net cash used in investing activities     (37) (53)          
Cash flows from financing activities:                  
Net borrowings under line of credit     109 656          
Payments on debt     (230) (230)          
Proceeds from issuance of common stock, net     4,612            
Proceeds from exercise of stock options and warrants       157          
Net cash provided by financing activities     4,491 583          
Net change in cash, cash equivalents and restricted cash     (1,439) (4,980)          
Cash, cash equivalents and restricted cash at beginning of period     9,520 12,576 12,576        
Cash, cash equivalents and restricted cash at end of period 8,081 7,596 8,081 7,596 9,520 12,576      
Reconciliation of cash, cash equivalents and restricted cash at end of period:                  
Cash and cash equivalents             $ 6,981 $ 6,720 $ 4,496
Restricted cash             1,100   3,100
Cash, cash equivalents and restricted cash at end of period $ 8,081 $ 7,596 $ 9,520 $ 12,576 $ 12,576 $ 12,576 $ 8,081 $ 9,520 $ 7,596