Annual report pursuant to Section 13 and 15(d)

Discontinued Operations (Narrative) (Details)

Discontinued Operations (Narrative) (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
GDS Business [Member]
Aug. 31, 2011
GDS Business [Member]
Dec. 31, 2012
GDS Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Initial cash payment for sale of operation       $ 30,000,000  
Aggregate maximum future royalty revenue from discontinued operation sold         20,000,000
Sale price of discontinued operation       30,300,000  
Additional cash payment received for sale of discontinued operation, attributable to a working capital adjustment       338,000  
Fees associated with the sale of the operation       2,800,000  
Balance sheet dispositions and write-offs at sale of operation       2,400,000  
Cash payment for transfer of extended warranty contracts     178,000    
Recognition of unamortized deferred revenue     1,200,000    
Gain on sale of discontinued operation 26,200,000        
Estimated tax liability from gain on sale of discontinued operation 6,700,000        
Write-off of inventory 1,000 65,000      
License revenue $ 63,000 $ 100,000