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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities    
Net loss $ (935) $ (1,685)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 199 178
Provision for inventory obsolescence (47) (24)
Stock based compensation 372 159
Change in fair value of derivative liabilities 26 (88)
Provision for allowance for doubtful accounts (9) (7)
Changes in current assets and liabilities:    
Trade receivables (277) 461
Prepaid expenses (26) (226)
Inventories (136) (1,240)
Deposits and other assets 4 (2)
Accounts payable 514 570
Accrued and other liabilities (793) (914)
Net cash used in operating activities (1,108) (2,818)
Cash flows from investing activities    
Purchases of technology, property and equipment (139) (71)
Net cash used in investing activities (139) (71)
Cash flows from financing activities    
Repayment of mortgage note payable (60) (59)
Net cash used in financing activities (60) (59)
Net change in cash, cash equivalents and restricted cash (1,307) (2,948)
Cash, cash equivalents and restricted cash, beginning of period 10,668 15,235
Cash, cash equivalents and restricted cash, end of period 9,361 12,287
Cash paid for:    
Interest paid $ 34 $ 31