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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities    
Net loss $ (9,607) $ (409)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 232 212
Recovery of (provision for) inventory obsolescence 53 (2)
Gain (loss) on disposal of property and equipment, net 4 (1)
Stock-based compensation 82 50
Change in fair value of liabilities 9,599 34
Provision (benefit) for deferred taxes 34 (349)
Changes in current assets and liabilities:    
Trade receivables (245) 948
Prepaid expenses and other current assets (437) (167)
Inventories 95 (551)
Deposits (203) (254)
Accounts payable (29) 82
Litigation settlement liability (441)   
Accrued and other liabilities (35) 154
Accrued payroll (62)   
Accrued vacation (89)   
Net cash used in operating activities (1,049) (253)
Cash flows from investing activities    
Purchases of property and equipment (75) (131)
Net cash used in investing activities (75) (131)
Cash flows from financing activities    
Proceeds from stock options exercised    18
Repayments of mortgage note payable 3,592   
Repayment of industrial revenue bonds (3,257) (34)
Repurchase of warrants (421)   
Net cash used in financing activities (86) (16)
Net change in cash and cash equivalents (1,210) (400)
Cash and cash equivalents, beginning of period 7,924 4,162
Cash and cash equivalents, end of period 5,816 3,762
Interest 28 55
Income taxes