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CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Oct. 02, 2016
Sep. 27, 2015
Cash flows from operating activities:    
Net loss $ (15,290) $ (13,002)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 972 1,075
Stock-based compensation 1,458 1,496
Write-down of inventories 236 14
Write-off of equipment 351 8
Changes in operating assets and liabilities:    
Accounts receivable 579 (81)
Inventories 1,199 2,566
Other assets 408 421
Trade payables (2,132) 397
Accrued liabilities and deferred revenue 601 547
Other long-term liabilities (76) 51
Net cash used in operating activities (11,694) (6,508)
Cash flows from investing activities:    
Capital expenditures for property and equipment (1,562) (237)
Net cash used in investing activities (1,562) (237)
Cash flows from financing activities:    
Payment of debt and capital lease obligations (259) (258)
Proceeds from line of credit 3,000 0
Proceeds from issuance of common stock 10,337 394
Stock issuance costs (1,197) 0
Net cash provided by financing activities 11,881 136
Net decrease in cash and cash equivalents (1,375) (6,609)
Cash and cash equivalents at beginning of period 19,136 30,050
Cash and cash equivalents at end of period 17,761 23,441
Supplemental schedule of non-cash investing and financing activities :    
Capital lease obligation to finance capital expenditures 230 349
Purchase of equipment included in accounts payable $ 323 $ 125