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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities    
Net loss $ (9,356) $ (1,529)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 453 416
Recovery of (provision for) inventory obsolescence 895 (3)
Gain (loss) on disposal of property and equipment, net 2   
Stock-based compensation 151 294
Change in fair value of liabilities 8,145 (4)
Provision (benefit) for deferred taxes (550) (903)
Change in assets and liabilities:    
Trade receivables (627) 500
Prepaid expenses and other current assets (312) 10
Inventories 598 (699)
Deposits (170) (377)
Accounts payable (29) 25
Accrued and other liabilities (513) 1,003
Net cash used in operating activities (1,313) (1,267)
Cash flows from investing activities    
Purchases of property and equipment (164) (293)
Net cash used in investing activities (164) (293)
Cash flows from financing activities    
Proceeds from stock options exercised 171 24
Change in restricted cash (898)  
Repayments of mortgage note payable 3,532   
Repayment of industrial revenue bonds (3,257) (68)
Repurchase of warrants (420)   
Net cash used in financing activities (872) (44)
Net change in cash and cash equivalents (2,349) (1,604)
Cash and cash equivalents, beginning of period 7,924 4,162
Cash and cash equivalents, end of period 5,575  
Interest 69 116
Income taxes