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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities    
Net loss $ (2,375) $ (9,356)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 421 453
Provision for (recovery of) inventory obsolescence $ (138) 895
Gain on disposal of property and equipment, net   2
Stock-based compensation $ 242 151
Non cash other (income) loss - warrants $ (1,534) 8,145
Benefit for deferred taxes   (550)
Changes in current assets and liabilities:    
Trade receivables $ (49) (627)
Prepaid expenses (159) (312)
Inventories (486) 598
Deposits and other assets (128) (170)
Accounts payable 190 (29)
Accrued and other liabilities (105) (513)
Net cash used in operating activities (4,121) (1,313)
Cash flows from investing activities    
Purchases of property and equipment (462) (164)
Net cash used in investing activities (462) (164)
Cash flows from financing activities    
Proceeds from stock options/warrants exercised 1,466 171
Change in restricted cash 60 (898)
Change in mortgage note payable (120) $ 3,532
Proceeds from issuance of common shares, net $ 11,531  
Repayment of industrial revenue bonds   $ (3,257)
Repurchase of warrants   (420)
Net cash provided by (used in) financing activities $ 12,937 (872)
Net change in cash and cash equivalents 8,354 (2,349)
Cash and cash equivalents, beginning of period 5,733 7,924
Cash and cash equivalents, end of period 14,087 5,575
Cash paid during the six months ended June 30, 2015 and for 2014 for:    
Interest paid, net $ 80 $ 69
Income taxes