Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details Textual)

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Basis of Presentation (Details Textual) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Basis of Presentation (Textual) [Abstract]            
Accumulated deficit $ (682,654,000)   $ (682,654,000)     $ (681,771,000)
Working capital (9,300,000)   (9,300,000)      
Period for which available resources are sufficient to satisfy company's anticipated operating and capital requirements     next twelve months      
Common shares included in computation 0 0 0 14,734    
Common shares excluded from computation     2,000,000 1,600,000    
Period allowed for return of products, minimum     30 days      
Period allowed for return of products, maximum     90 days      
Income tax benefit (expense) (338,000) (141,000) (303,000) 13,444,000    
Income tax expense from discontinued operations (191,000)    (14,000)       
Maturity period of cash and cash equivalents     three months or less      
Maturity period of cash and cash equivalents, maximum     3 months      
Maturity period of short term investments     more than three months      
Maturity period of short term investments, minimum     3 months      
FDIC insured amount 250,000,000   250,000,000      
Cash deposits 9,900,000   9,900,000     13,100,000
Percentage of accounts receivable 37.00%   37.00%     67.00%
Accounts receivable outstanding considered past due after period, minimum     30 days      
Accounts receivable outstanding considered past due after period, maximum     90 days      
Allowance for doubtful accounts 0   0     0
Amortization expense     1,200,000 1,300,000    
Estimated amortization expense         2,300,000  
Deferred revenue 1,000,000   1,000,000     1,200,000
Amount included in current portion of deferred revenue 400,000   400,000      
Amount included in long-term portion of deferred revenue $ 600,000   $ 600,000      
Equipment [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Estimated useful life of assets     three to ten years      
Estimated useful life of assets, minimum     3 years      
Estimated useful life of assets, maximum     10 years