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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Cash flows from operating activities:    
Net loss $ (3,476) $ (3,970)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 292 339
Stock-based compensation 951 432
Write-down of inventories 80 42
Write-off of equipment 0 5
Tax benefit from acquisition (282) 0
Changes in operating assets and liabilities:    
Accounts receivable (242) (329)
Inventories 185 (33)
Other assets (344) (609)
Trade payables 327 (6)
Accrued liabilities (391) 324
Other long-term liabilities (16) 51
Net cash used in operating activities (2,916) (3,754)
Cash flows from investing activities:    
Capital expenditures for property and equipment (111) (48)
Cash received from business acquisition 20 0
Net cash used in investing activities (91) (48)
Cash flows from financing activities:    
Payment of finance lease obligations (74) (123)
Proceeds from line of credit 12,000 6,000
Payment of line of credit (12,000) (6,000)
Proceeds from issuance of common stock 4 0
Taxes for net issuance of stock awards (167) (41)
Net cash used by financing activities (237) (164)
Net decrease in cash, cash equivalents and restricted cash (3,244) (3,966)
Cash, cash equivalents and restricted cash at beginning of period 26,463 16,527
Cash, cash equivalents and restricted cash at end of period 23,219 12,561
Supplemental schedule of non-cash investing and financing activities :    
Purchase of equipment included in accounts payable $ 1 $ 38