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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities    
Net loss $ (1,685) $ (1,944)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 178 182
Provision (recovery) of inventory obsolescence (24) 409
Gain on disposal of property and equipment, net 0 6
Stock based compensation 159 176
Change in fair value of derivative liabilities (88) (87)
Provision for allowance for doubtful accounts (7) 106
Provision (benefit) for deferred taxes 0 (14)
Changes in current assets and liabilities:    
Trade receivables 461 (322)
Prepaid expenses (226) (18)
Inventories (1,240) (1,013)
Deposits and other assets (2) 39
Accounts payable 570 328
Accrued and other liabilities (914) (115)
Net cash used in operating activities (2,818) (2,267)
Cash flows from investing activities    
Purchases of property and equipment (71) (21)
Net cash used in investing activities (71) (21)
Cash flows from financing activities    
Change in restricted cash 0 0
Repayment of mortgage note payable (59) (61)
Net cash used in financing activities (59) (61)
Net change in cash and cash equivalents (2,948) (2,349)
Cash and cash equivalents, beginning of period 14,456 11,805
Cash and cash equivalents, end of period 11,508 9,456
Cash paid for:    
Interest paid, net $ 31 $ 38