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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating Activities:    
Net loss $ (1,083) $ (1,412)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 41 61
Stock-based compensation expense 84 159
Issuance of warrants for services 10 10
Amortization of warrants issued for debt issuance costs 77  
Provision for doubtful accounts   15
Change in operating assets and liabilities:    
Accounts receivable 86 451
Inventories 16 51
Prepaid expenses and other current assets   (37)
Accounts payable 115 (15)
Deferred revenue (116) 72
Accrued liabilities (12) 82
Net cash used in operating activities (782) (563)
Investing activities    
Purchases of property and equipment (27) (20)
Net cash used in investing activities (27) (20)
Financing activities    
Proceeds from the issuance of common stock under Associates Stock Purchase Plan   14
Proceeds from the issuance of common stock   1,377
Net cash provided by financing activities   1,391
Increase (Decrease) in Cash and Cash Equivalents (809) 808
Cash and Cash Equivalents, beginning of period 1,484 2,252
Cash and Cash Equivalents, end of period 675 3,060
Noncash Financing Activity:    
Conversion of convertible debt to common stock $ 251