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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Cash flows from operating activities:    
Net loss $ (10,714) $ (10,722)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 980 1,041
Stock-based compensation 1,427 1,060
Write-down of inventories 206 127
Write-off of equipment 5 10
Changes in operating assets and liabilities:    
Accounts receivable (301) (815)
Inventories (736) (1,416)
Other assets (59) 206
Trade payables (232) (509)
Accrued liabilities 562 211
Other long-term liabilities 33 (24)
Net cash used in operating activities (8,829) (10,831)
Cash flows from investing activities:    
Capital expenditures for property and equipment (112) (146)
Net cash used in investing activities (112) (146)
Cash flows from financing activities:    
Payment of capital lease obligations (329) (322)
Proceeds from line of credit 21,000 12,000
Payment of line of credit (18,000) (12,000)
Proceeds from issuance of common stock 15,859 17,316
Stock issuance costs (1,638) (1,771)
Taxes for net issuance of stock awards (259) (87)
Net cash provided by financing activities 16,633 15,136
Net increase in cash and cash equivalents 7,692 4,159
Cash and cash equivalents at beginning of period 16,527 14,870
Cash and cash equivalents at end of period 24,219 19,029
Supplemental schedule of non-cash investing and financing activities :    
Capital lease obligation to finance capital expenditures 502 274
Purchase of equipment included in accounts payable $ 9 $ 1