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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
sqft
Sep. 30, 2012
Sep. 30, 2013
sqft
Sep. 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 $ 804,000 $ 740,000 $ 588,000 $ 1,003,000  
Accruals for warranties issued 183,000 92,000 558,000 331,000  
Adjustments related to pre-existing warranties including expirations and changes in estimates 14,000 (57,000) 351,000 (338,000)  
Cost of warranty repair (106,000) (78,000) (602,000) (299,000)  
Ending accrued warranty and related costs 895,000 697,000 895,000 697,000  
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
Savings as a result of revised facility area         382,000
Outstanding contractual obligations [Abstract]          
Total 3,904,000   3,904,000    
Less than 1 year 1,010,000   1,010,000    
1-3 years 1,600,000   1,600,000    
4-5 years 1,150,000   1,150,000    
More than 5 years 144,000   144,000    
Operating leases [Member]
          
Outstanding contractual obligations [Abstract]          
Total 379,000   379,000    
Less than 1 year 210,000   210,000    
1-3 years 169,000   169,000    
4-5 years 0   0    
More than 5 years 0   0    
Royalty agreement [Member]
          
Outstanding contractual obligations [Abstract]          
Total 3,525,000   3,525,000    
Less than 1 year 800,000   800,000    
1-3 years 1,431,000   1,431,000    
4-5 years 1,150,000   1,150,000    
More than 5 years $ 144,000   $ 144,000