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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Cash flows from operating activities:    
Net loss $ (7,189) $ (2,907)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 144 126
Interest accrued on convertible promissory note 150  
Amortization of debt discount 108 108
Stock-based compensation 645 761
Changes in operating assets and liabilities:    
Restricted cash   (200)
Accounts receivable (68) (306)
Inventories (1,748) (312)
Prepaid expenses and other assets 122 191
Accounts payable 2,620 1,026
Accrued payroll and related liabilities (296) (191)
Accrued expenses and other current liabilities 2 44
Deferred revenue   (6,857)
Net cash used in operating activities (5,510) (8,517)
Cash flows from investing activities:    
Acquisition of property and equipment (53) (274)
Net cash used in investing activities (53) (274)
Cash flows from financing activities:    
Net borrowing under line of credit 656  
Payments on debt (230) (137)
Proceeds from exercise of stock options 157 47
Net cash provided by (used in) financing activities 583 (90)
Net change in cash and cash equivalents (4,980) (8,881)
Cash and cash equivalents at beginning of period 9,476 19,684
Cash and cash equivalents at end of period $ 4,496 $ 10,803