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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating Activities:    
Net loss $ (1,412) $ (1,828)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 61 80
Stock-based compensation expense 159 161
Issuance of common stock for services 10 114
Issuance of warrants for services   71
Amortization of warrants issued for debt issuance costs   3
Provision for doubtful accounts 15 (1)
Change in operating assets and liabilities:    
Accounts receivable 451 225
Inventories 51 46
Prepaid expenses and other current assets (37) 31
Accounts payable (15) (249)
Deferred revenue 72 (76)
Accrued liabilities 82 170
Net cash used in operating activities (563) (1,253)
Investing activities    
Purchases of property and equipment (20) (10)
Net cash used in investing activities (20) (10)
Financing activities    
Payments on capital lease obligations   (11)
Proceeds from the issuance of common stock 1,377  
Proceeds from the sale of common stock under associate stock purchase plan 14 32
Net cash provided by financing activities 1,391 21
Effect of Exchange Rate Changes on Cash   (4)
Increase (Decrease) in Cash and Cash Equivalents 808 (1,246)
Cash and Cash Equivalents, beginning of period 2,252 5,478
Cash and Cash Equivalents, end of period $ 3,060 $ 4,232