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Commitments and Contingencies (Details) (USD $)
 12 Months Ended 1 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Apr. 30, 2012
Settled litigation
Sep. 30, 2010
Settled litigation
Sep. 30, 2012
Settled litigation
Mar. 31, 2012
Settled litigation
Commitments and Contingencies              
Rent expense $ 895,000 $ 915,000 $ 694,000        
Future minimum lease payments, Operating leases              
2013 739,000            
2014 764,000            
2015 720,000            
2016 743,000            
2017 764,000            
Thereafter 1,943,000            
Total minimum payments 5,673,000            
Future minimum lease payments, Purchase commitments              
2013 878,000            
2014 566,000            
2015 500,000            
Total minimum payments 1,944,000            
Future minimum lease payments, Total              
2013 1,617,000            
2014 1,330,000            
2015 1,220,000            
2016 743,000            
2017 764,000            
Thereafter 1,943,000            
Total minimum payments 7,617,000            
Commitments and Contingencies              
Contractual payment sought (in shares)         200,000    
Cash award       1,400,000      
Value of shares retired, which were sought as damages             800,000
Amount recorded as expense           $ 600,000