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CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Cash flows from operating activities:    
Net loss $ (10,722) $ (15,290)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,041 972
Stock-based compensation 1,060 1,458
Write-down of inventories 127 236
Write-off of equipment 10 351
Changes in operating assets and liabilities:    
Accounts receivable (815) 579
Inventories (1,416) 1,199
Other assets 206 408
Trade payables (509) (2,132)
Accrued liabilities 211 601
Other long-term liabilities (24) (76)
Net cash used in operating activities (10,831) (11,694)
Cash flows from investing activities:    
Capital expenditures for property and equipment (146) (1,562)
Net cash used in investing activities (146) (1,562)
Cash flows from financing activities:    
Payment of capital lease obligations (322) (259)
Proceeds from line of credit 12,000 3,000
Payment of line of credit (12,000) 0
Proceeds from issuance of common stock 17,316 10,448
Stock issuance costs (1,771) (1,197)
Taxes for net issuance of stock awards (87) (111)
Net cash provided by financing activities 15,136 11,881
Net increase (decrease) in cash and cash equivalents 4,159 (1,375)
Cash and cash equivalents at beginning of period 14,870 19,136
Cash and cash equivalents at end of period 19,029 17,761
Supplemental schedule of non-cash investing and financing activities :    
Capital lease obligation to finance capital expenditures 274 230
Purchase of equipment included in accounts payable $ 1 $ 323