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Cash, Cash Equivalents and Investments (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash, cash equivalents and investments [Abstract]        
Cash $ 24,852,000 $ 26,250,000    
Cash Equivalents, at Carrying Value [Abstract]        
Money Market Funds 109,000 4,384,000    
Cash and Cash Equivalents, at Carrying Value, Total 24,961,000 30,634,000 26,156,000 23,724,000
Amortized Cost 45,682,000 50,144,000    
Gross Unrealized Gain 1,933,000 16,000    
Gross Unrealized (Loss) (10,000) (65,000)    
Fair Value 47,605,000 50,095,000    
Contractual maturities on investments, amortized cost basis [Abstract]        
Due within 1 year 10,569,000 10,288,000    
Due after 1 through 5 years 10,152,000 9,222,000    
Investments, amortized cost 20,721,000 19,510,000    
Contractual maturities on investments, fair value basis [Abstract]        
Due within 1 year 12,499,000 10,270,000    
Due after 1 through 5 years 10,145,000 9,191,000    
Investments, fair value 22,644,000 19,461,000    
Gross realized losses on available-for-sale securities 0 0 8,000  
Gross realized gains on available-for-sale securities 0 0    
Unrealized gain, net of tax 1,600,000      
Gain on sale of available for sale security 800,000      
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]        
Fair value, in loss position less than twelve months 7,898,000 8,323,000    
Gross unrealized loss, in loss position less than twelve months (9,000) (41,000)    
Fair value, in loss position greater than twelve months 4,431,000 1,701,000    
Gross unrealized loss, in loss position greater than twelve months (1,000) (24,000)    
Fair value, total in loss position 12,329,000 10,024,000    
Gross unrealized loss, total in loss position (10,000) (65,000)    
Investment in privately held Companies [Abstract]        
Minority investments in unconsolidated privately-held companies 200,000 392,000    
Assets [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 24,961,000 30,634,000    
Recurring [Member]
        
Assets [Abstract]        
Assets, fair value 22,753,000 23,845,000    
Liabilities [Abstract]        
Liabilities, fair value 0 0    
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
        
Assets [Abstract]        
Assets, fair value 109,000 4,384,000    
Liabilities [Abstract]        
Liabilities, fair value 0 0    
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
        
Assets [Abstract]        
Assets, fair value 22,644,000 19,461,000    
Liabilities [Abstract]        
Liabilities, fair value 0 0    
Recurring [Member] | Money market fund - cash [Member]
        
Assets [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 109,000 4,384,000    
Recurring [Member] | Money market fund - cash [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
        
Assets [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 109,000 4,384,000    
Recurring [Member] | Money market fund - cash [Member] | Significant Other Observable Inputs (Level 2) [Member]
        
Assets [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 0 0    
Recurring [Member] | Certificates of deposit [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 6,318,000 6,645,000    
Recurring [Member] | Certificates of deposit [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Recurring [Member] | Certificates of deposit [Member] | Significant Other Observable Inputs (Level 2) [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 6,318,000 6,645,000    
Recurring [Member] | Corporate bonds [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 14,278,000 12,816,000    
Recurring [Member] | Corporate bonds [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Recurring [Member] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 14,278,000 12,816,000    
Recurring [Member] | Corporate equity security [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 2,048,000      
Recurring [Member] | Corporate equity security [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 0      
Recurring [Member] | Corporate equity security [Member] | Significant Other Observable Inputs (Level 2) [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 2,048,000      
Other assets [Member]
        
Investment in privately held Companies [Abstract]        
Investments in privately-held companies 10,900,000 9,400,000    
Minority investments in unconsolidated privately-held companies 200,000 392,000    
Certificates of deposit [Member]
        
Cash Equivalents, at Carrying Value [Abstract]        
Amortized Cost 6,320,000 6,638,000    
Gross Unrealized Gain 2,000 9,000    
Gross Unrealized (Loss) (4,000) (2,000)    
Fair Value 6,318,000 6,645,000    
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]        
Fair value, in loss position less than twelve months 3,425,000 1,877,000    
Gross unrealized loss, in loss position less than twelve months (4,000) (1,000)    
Fair value, in loss position greater than twelve months 720,000 199,000    
Gross unrealized loss, in loss position greater than twelve months 0 (1,000)    
Fair value, total in loss position 4,145,000 2,076,000    
Gross unrealized loss, total in loss position (4,000) (2,000)    
Corporate bonds [Member]
        
Cash Equivalents, at Carrying Value [Abstract]        
Amortized Cost 4,276,000 12,872,000    
Gross Unrealized Gain 8,000 7,000    
Gross Unrealized (Loss) (6,000) (63,000)    
Fair Value 14,278,000 12,816,000    
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]        
Fair value, in loss position less than twelve months 4,473,000 6,446,000    
Gross unrealized loss, in loss position less than twelve months (5,000) (40,000)    
Fair value, in loss position greater than twelve months 3,711,000 1,502,000    
Gross unrealized loss, in loss position greater than twelve months (1,000) (23,000)    
Fair value, total in loss position 8,184,000 7,948,000    
Gross unrealized loss, total in loss position (6,000) (63,000)    
Corporate equity security [Member]
        
Cash Equivalents, at Carrying Value [Abstract]        
Amortized Cost 125,000 0    
Gross Unrealized Gain 1,923,000 0    
Gross Unrealized (Loss) 0 0    
Fair Value 2,048,000 0    
Total Investments [Member]
        
Cash Equivalents, at Carrying Value [Abstract]        
Amortized Cost 20,721,000 19,510,000    
Gross Unrealized Gain 1,933,000 16,000    
Gross Unrealized (Loss) (10,000) (65,000)    
Fair Value $ 22,644,000 $ 19,461,000