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Investments and Fair Value Measurements (Details 2) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]    
Fair value, in loss position less than twelve months $ 11,191,000 $ 8,262,000
Gross unrealized loss, in loss position less than twelve months (41,000) (40,000)
Fair value, in loss position greater than twelve months 2,591,000 4,309,000
Gross unrealized loss, in loss position greater than twelve months (3,000) (2,000)
Fair value, total in loss position 13,782,000 12,571,000
Gross unrealized loss, total in loss position (44,000) (42,000)
Minority Investments [Abstract]    
Minority investments in unconsolidated privately-held companies   200,000
Certificates of Deposit [Member]    
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]    
Fair value, in loss position less than twelve months 4,274,000 4,492,000
Gross unrealized loss, in loss position less than twelve months (6,000) (13,000)
Fair value, in loss position greater than twelve months 720,000  
Fair value, total in loss position 4,994,000 4,492,000
Gross unrealized loss, total in loss position (6,000) (13,000)
Corporate Bonds [Member]    
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]    
Fair value, in loss position less than twelve months 6,917,000 3,770,000
Gross unrealized loss, in loss position less than twelve months (35,000) (27,000)
Fair value, in loss position greater than twelve months 1,871,000 4,309,000
Gross unrealized loss, in loss position greater than twelve months (3,000) (2,000)
Fair value, total in loss position 8,788,000 8,079,000
Gross unrealized loss, total in loss position (38,000) (29,000)
Other Assets [Member]    
Minority Investments [Abstract]    
Investments in privately-held companies $ 12,500,000 12,100,000
Minority investments in unconsolidated privately-held companies   $ 200,000