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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
sqft
Jun. 30, 2012
Jun. 30, 2013
sqft
Jun. 30, 2012
Aug. 02, 2013
sqft
Product Warranty [Abstract]          
Period of warranty     12 months    
Change in warranty accrual [Roll Forward]          
Beginning accrued warranty and related costs $ 749,000 $ 997,000 $ 588,000 $ 1,003,000  
Accruals for warranties issued 111,000 137,000 375,000 239,000  
Adjustments related to pre-existing warranties including expirations and changes in estimates 171,000 (274,000) 337,000 (282,000)  
Cost of warranty repair (227,000) (120,000) (496,000) (220,000)  
Ending accrued warranty and related costs 804,000 740,000 804,000 740,000  
Contractual Obligations [Abstract]          
Area of property under long-term operating lease (in square feet) 27,760   27,760    
Period of operating lease     7 years    
Period to be lapsed for cancelling lease 5 years   5 years    
Penalty payment     142,000    
Term of royalty agreement     8 years    
Aggregate amount payable towards royalty 7,000,000   7,000,000    
Revised facility area         20,767
Term of revised area contract         2 years
Savings as a result of revised facility area         382,000
Outstanding contractual obligations [Abstract]          
Total 3,938,000   3,938,000    
Less than 1 year 998,000   998,000    
1-3 years 1,503,000   1,503,000    
4-5 years 1,150,000   1,150,000    
More than 5 years 287,000   287,000    
Operating leases [Member]
          
Outstanding contractual obligations [Abstract]          
Total 213,000   213,000    
Less than 1 year 198,000   198,000    
1-3 years 15,000   15,000    
4-5 years 0   0    
More than 5 years 0   0    
Royalty agreement [Member]
          
Outstanding contractual obligations [Abstract]          
Total 3,725,000   3,725,000    
Less than 1 year 800,000   800,000    
1-3 years 1,488,000   1,488,000    
4-5 years 1,150,000   1,150,000    
More than 5 years $ 287,000   $ 287,000