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Commitments and Contingencies (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended
Dec. 01, 2013
Jun. 30, 2014
sqft
Jun. 30, 2013
Jun. 30, 2014
sqft
Jun. 30, 2013
Aug. 02, 2013
sqft
Product Warranty [Abstract]            
Period of warranty       12 months    
Change in warranty accrual [Roll Forward]            
Beginning accrued warranty and related costs   $ 1,227,000 $ 749,000 $ 1,048,000 $ 588,000  
Accruals for warranties issued   81,000 111,000 577,000 375,000  
Adjustments related to pre-existing warranties including expirations and changes in estimates   (199,000) 171,000 (302,000) 337,000  
Cost of warranty repair   (129,000) (227,000) 343,000 (496,000)  
Ending accrued warranty and related costs   980,000 804,000 980,000 804,000  
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    
Penalty payment       142,000    
Revised facility area           20,767
Term of revised area contract 2 years          
Savings as a result of revised facility area           382,000
Aggregate amount payable towards royalty   7,000,000   7,000,000    
Term of royalty agreement       8 years    
Outstanding contractual obligations [Abstract]            
Total   3,431,000   3,431,000    
Less than 1 year   1,078,000   1,078,000    
1-3 years   1,411,000   1,411,000    
4-5 years   897,000   897,000    
More than 5 years   45,000   45,000    
Operating leases [Member]
            
Outstanding contractual obligations [Abstract]            
Total   506,000   506,000    
Less than 1 year   278,000   278,000    
1-3 years   149,000   149,000    
4-5 years   34,000   34,000    
More than 5 years   45,000   45,000    
Royalty agreement [Member]
            
Outstanding contractual obligations [Abstract]            
Total   2,925,000   2,925,000    
Less than 1 year   800,000   800,000    
1-3 years   1,262,000   1,262,000    
4-5 years   863,000   863,000    
More than 5 years   $ 0   $ 0