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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (6,065) $ (6,114)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 277 399
Stock-based compensation 557 706
Provision for doubtful accounts receivable 20 (15)
Provision for slow-moving and obsolete inventories and valuation reserves (643) (532)
Provision for warranties 107 46
Amortization of loan origination fees (72) 0
Loss on dispositions of property and equipment 15 4
Changes in operating assets and liabilities:    
Accounts receivable 400 648
Inventories 1,301 (184)
Prepaid and other assets 368 (647)
Accounts payable (2,311) 1,447
Accrued and other liabilities (421) 391
Deferred revenue (6) 5
Total adjustments (264) 2,268
Net cash used in operating activities (6,329) (3,846)
Cash flows from investing activities:    
Acquisitions of property and equipment (57) (57)
Proceeds from the sale of property and equipment 0 240
Net cash (used in) provided by investing activities (57) 183
Cash flows from financing activities:    
Proceeds from exercises of stock options and employee stock purchase plan purchases 0 21
Common stock withheld to satisfy income tax withholding on vesting of restricted stock units (116) (60)
Principal payments under finance lease obligations (2) 0
Proceeds from convertible notes 1,700 0
Net repayments on credit line borrowings (896) 0
Net cash provided by (used in) financing activities 686 (39)
Effect of exchange rate changes on cash (1) (5)
Net decrease in cash and cash equivalents (5,701) (3,707)
Cash and cash equivalents, beginning of period 6,335 10,761
Cash and cash equivalents, end of period 634 7,054
Classification of cash and cash equivalents:    
Cash and cash equivalents, end of period $ 6,335 $ 10,761