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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Cash flows from operating activities:    
Net loss $ (12,452) $ (17,120)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 172 254
Interest accrued on convertible promissory notes 415 361
Amortization of debt discounts 480 334
Non-cash lease expense 534  
Stock-based compensation 989 737
Issuance of warrant in lieu of payment   74
Changes in operating assets and liabilities:    
Accounts receivable (755) 80
Inventories (550) 1,159
Prepaid expenses and other current assets 480 359
Accounts payable (363) 3,375
Accrued payroll and related liabilities 136 (203)
Accrued expenses and other current liabilities (571) 22
Net cash used in operating activities (11,485) (10,568)
Cash flows from investing activities:    
Acquisition of property and equipment (83) (74)
Net cash used in investing activities (83) (74)
Cash flows from financing activities:    
Net borrowings under line of credit 697 269
Proceeds from issuance of debt, net of $170 discount   2,100
Debt issuance costs   (23)
Principal repayments under finance lease (13)  
Payments on debt (376) (345)
Proceeds from issuance of common stock, net 6,352 15,762
Proceeds from exercise of stock options 49 11
Payments for taxes related to net share settlement of equity awards (77)  
Net cash provided by financing activities 6,632 17,774
Net change in cash, cash equivalents and restricted cash (4,936) 7,132
Cash, cash equivalents and restricted cash at beginning of period 16,652 9,520
Cash, cash equivalents and restricted cash at end of period $ 11,716 $ 16,652