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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
sqft
Jun. 30, 2011
Jun. 30, 2012
sqft
Jun. 30, 2011
Product Warranty [Abstract]        
Period of warranty 12 months 12 months 12 months 12 months
Change in warranty accrual [Roll Forward]        
Beginning accrued warranty and related costs $ 997,000 $ 798,000 $ 1,003,000 $ 740,000
Charges/(benefit) to cost of revenue (394,000) (255,000) (502,000) (270,000)
Actual warranty expenditures 137,000 334,000 239,000 407,000
Ending accrued warranty and related costs 740,000 877,000 740,000 877,000
Contractual Obligations [Abstract]        
Area of property under long-term operating lease (in square feet) 27,760   27,760  
Period of operating lease 7 years   7 years  
Period to be lapsed for cancelling lease 5 years   5 years  
Percentage of annual rent to be paid for cancelling lease (in hundredths) 50.00%   50.00%  
Term of royalty agreement 8 years   8 years  
Aggregate amount payable towards royalty 7,000,000   7,000,000  
Outstanding contractual obligations [Abstract]        
Total 5,957,000   5,957,000  
Less than 1 year 1,412,000   1,412,000  
1-3 years 2,284,000   2,284,000  
3-5 years 1,399,000   1,399,000  
More than 5 years 862,000   862,000  
Operating leases [Member]
        
Outstanding contractual obligations [Abstract]        
Total 1,207,000   1,207,000  
Less than 1 year 387,000   387,000  
1-3 years 684,000   684,000  
3-5 years 136,000   136,000  
More than 5 years 0   0  
Royalty agreement [Member]
        
Outstanding contractual obligations [Abstract]        
Total 4,750,000   4,750,000  
Less than 1 year 1,025,000   1,025,000  
1-3 years 1,600,000   1,600,000  
3-5 years 1,263,000   1,263,000  
More than 5 years $ 862,000   $ 862,000