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Business Combinations (Details) (USD $)
0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Nov. 02, 2011
Nethra Imaging [Member]
Nov. 02, 2011
Nethra Imaging [Member]
Existing Technology [Member]
Y
Nov. 02, 2011
Nethra Imaging [Member]
Customer Relationships [Member]
Y
Jan. 02, 2011
Assets of IKOR Acquisition Corporation [Member]
Apr. 03, 2011
Assets of IKOR Acquisition Corporation [Member]
Apr. 16, 2010
Assets of IKOR Acquisition Corporation [Member]
Apr. 16, 2010
Assets of IKOR Acquisition Corporation [Member]
Existing Technology [Member]
Y
Apr. 16, 2010
Assets of IKOR Acquisition Corporation [Member]
Customer Relationships [Member]
Y
Apr. 16, 2010
Assets of IKOR Acquisition Corporation [Member]
Backlog [Member]
M
Business Acquisition [Line Items]                  
Total purchase price           $ 7,700,000      
Contingent consideration         1,800,000 1,500,000      
Cash consideration 2,000,000                
Cash held in escrow 300,000         1,800,000      
Rights to existing patents, quantity 1                
Rights to existing patent applications 8                
Maximum payment for contingent consideration           2,800,000      
Increase in fair value of contingent consideration         300,000        
Contingent consideration paid through the release of funds held in escrow       1,800,000          
Acquisition-related costs incurred         300,000        
Purchase price allocation [Abstract]                  
Accounts receivable           836,000      
Inventories           1,136,000      
Prepayments and other current assets           63,000      
Property, plant and equipment, net 51,000         277,000      
Accounts payable and accrued expenses           (1,226,000)      
Amortizable intangible assets   874,000 435,000     5,711,000      
Goodwill 640,000         946,000      
Total purchase price 2,000,000         7,743,000      
Amortizable intangible assets:                  
Discount factor (in hundredths)   31.00% 31.00%         35.00% 15.00%
Discount factor, minimum (in hundredths)             35.00%    
Discount factor, maximum (in hundredths)             36.00%    
Amortization period for acquired intangible assets   3 3       7 5 5
Amortizable intangible assets           $ 5,711,000 $ 5,224,000 $ 443,000 $ 44,000