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Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
sqft
Dec. 31, 2011
Dec. 31, 2010
Leases [Abstract]      
Area of property under long-term operating lease (in square feet) 27,760    
Period of operating lease 7 years    
Period to be lapsed for cancelling lease 5 years    
Percentage of annual rent to be paid for cancelling lease (in hundredths) 50.00%    
Rent expenses under the operating leases $ 447,000 $ 460,000 $ 308,000
Summary of total minimum lease payments [Abstract]      
2013 396,000    
2014 322,000    
2015 295,000    
2016 1,000    
Total 1,014,000    
Royalty Agreement [Abstract]      
Term of royalty agreement 8 years    
Aggregate amount payable towards royalty 7,000,000    
Royalty expense 1,400,000 1,300,000  
Summary of total royalty payments under the agreement[Abstract]      
2013 800,000    
2014 800,000    
2015 800,000    
2016 575,000    
2017 575,000    
Thereafter 575,000    
Total royalty payments $ 4,125,000