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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities    
Net loss $ (3,963) $ (12,092)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 631 656
Provision for (recovery of) inventory obsolescence (42) 985
Gain on disposal of property and equipment, net 18 11
Stock-based compensation 380 278
Non cash other (income) loss - warrants $ (1,800) 9,820
Benefit for deferred taxes (1,900)
Changes in current assets and liabilities:    
Trade receivables $ (532) (56)
Prepaid expenses (23) (58)
Inventories (361) 947
Deposits and other assets 34 729
Accounts payable 788 311
Accrued and other liabilities 105 (246)
Net cash used in operating activities (4,765) (615)
Cash flows from investing activities    
Purchases of property and equipment (604) (319)
Net cash used in investing activities (604) (319)
Cash flows from financing activities    
Proceeds from stock options/warrants exercised 1,427 249
Change in restricted cash 60 (898)
Change in mortgage note payable (180) $ 3,472
Proceeds from issuance of common shares, net $ 11,531
Repayment of industrial revenue bonds $ (3,257)
Repurchase of warrants (421)
Net cash provided by (used in) financing activities $ 12,838 (855)
Net change in cash and cash equivalents 7,469 (1,789)
Cash and cash equivalents, beginning of period 5,733 7,924
Cash and cash equivalents, end of period 13,202 6,135
Cash paid for:    
Interest paid, net $ 120 $ 111
Income taxes