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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Jan. 03, 2016
Dec. 28, 2014
Cash flows from operating activities:      
Net loss $ (19,148) $ (17,848) $ (13,079)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 1,332 1,409 1,510
Shares issued to third parties for services provided 0 87 0
Stock-based compensation 1,584 1,941 2,242
Write-down of inventories 296 229 119
Write-off of equipment 368 8 5
Changes in operating assets and liabilities:      
Accounts receivable 762 (49) 1,709
Inventories 565 1,845 (935)
Other assets 305 300 604
Trade payables (1,337) 260 (2,002)
Accrued liabilities 124 (94) (882)
Deferred income (26) 26 0
Other long-term liabilities (84) 57 (45)
Net cash used in operating activities (15,259) (11,829) (10,754)
Cash flows from investing activities:      
Capital expenditures for property and equipment (1,954) (346) (1,046)
Proceeds from sale of equipment 0 0 2
Net cash used in investing activities (1,954) (346) (1,044)
Cash flows from financing activities:      
Payment of capital software lease obligations (280) (293) (300)
Proceeds from issuance of common stock 11,127 910 6,638
Stock issuance costs (1,197) 0  
Stock issuance costs     40
Taxes paid related to net settlement of equity awards (703) (356) (1,936)
Borrowings from line of credit 4,000 1,000 0
Net cash provided by financing activities 12,947 1,261 4,442
Net (decrease) in cash and cash equivalents (4,266) (10,914) (7,356)
Cash and cash equivalents at beginning of period 19,136 30,050 37,406
Cash and cash equivalents at end of period 14,870 19,136 30,050
Supplemental disclosures of cash flow information:      
Interest paid 183 77 85
Income taxes paid 128 121 48
Supplemental schedule of non-cash investing and financing activities :      
Capital software lease obligation to finance capital expenditures 209 489 416
Purchase of equipment included in accounts payable 0 977 441
Issuance of restricted stock units for accrued compensation 0 0 1,064
Stock warrants exercised in cashless transactions, net $ 0 $ 0 $ 78