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Investments in Marketable Securities and Fair Value Measurements (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Cash, cash equivalents and investments [Abstract]        
Cash $ 24,114,000 $ 26,250,000    
Cash Equivalents, at Carrying Value [Abstract]        
Money market funds 3,609,000 4,384,000    
Cash Equivalents, at Carrying Value, Total 27,723,000 30,634,000 35,503,000 26,156,000
Amortized Cost 48,445,000 50,144,000    
Gross Unrealized Gain 11,000 16,000    
Gross Unrealized (Loss) (34,000) (65,000)    
Fair Value 48,422,000 50,095,000    
Contractual maturities on investments, amortized cost basis [Abstract]        
Due within 1 year 8,405,000 10,288,000    
Due after 1 through 5 years 12,317,000 9,222,000    
Investments, amortized cost 20,722,000 19,510,000    
Contractual maturities on investments, fair value basis [Abstract]        
Due within 1 year 8,412,000 10,270,000    
Due after 1 through 5 years 12,287,000 9,191,000    
Investments, fair value 20,699,000 19,461,000    
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]        
Fair value, in loss position less than twelve months 15,409,000 8,323,000    
Gross unrealized loss, in loss position less than twelve months (34,000) (41,000)    
Fair value, in loss position greater than twelve months 0 1,701,000    
Gross unrealized loss, in loss position greater than twelve months 0 (24,000)    
Fair value, total in loss position 15,409,000 10,024,000    
Gross unrealized loss, total in loss position (34,000) (65,000)    
Minority Investments [Abstract]        
Minority investments in unconsolidated privately-held companies 325,000 392,000    
Recurring [Member]
        
Assets [Abstract]        
Assets, fair value 24,308,000 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 3,609,000 4,384,000    
Liabilities [Abstract]        
Liabilities, fair value 0 0    
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
        
Assets [Abstract]        
Assets, fair value 20,699,000 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 3,609,000 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 3,609,000 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 6,316,000 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 6,316,000 6,645,000    
Recurring [Member] | Corporate bonds [Member]
        
Assets [Abstract]        
Available-for-sale Securities, Fair Value Disclosure 14,383,000 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 14,383,000 12,816,000    
Other assets [Member]
        
Minority Investments [Abstract]        
Investments in privately-held companies 10,600,000 9,400,000    
Minority investments in unconsolidated privately-held companies 325,000 392,000    
Certificates of deposit [Member]
        
Cash Equivalents, at Carrying Value [Abstract]        
Amortized Cost 6,320,000 6,638,000    
Gross Unrealized Gain 5,000 9,000    
Gross Unrealized (Loss) (9,000) (2,000)    
Fair Value 6,316,000 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 3,671,000 1,877,000    
Gross unrealized loss, in loss position less than twelve months (9,000) (1,000)    
Fair value, in loss position greater than twelve months 0 199,000    
Gross unrealized loss, in loss position greater than twelve months 0 (1,000)    
Fair value, total in loss position 3,671,000 2,076,000    
Gross unrealized loss, total in loss position (9,000) (2,000)    
Corporate bonds [Member]
        
Cash Equivalents, at Carrying Value [Abstract]        
Amortized Cost 14,402,000 12,872,000    
Gross Unrealized Gain 6,000 7,000    
Gross Unrealized (Loss) (25,000) (63,000)    
Fair Value 14,383,000 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 11,738,000 6,446,000    
Gross unrealized loss, in loss position less than twelve months (25,000) (40,000)    
Fair value, in loss position greater than twelve months 0 1,502,000    
Gross unrealized loss, in loss position greater than twelve months 0 (23,000)    
Fair value, total in loss position 11,738,000 7,948,000    
Gross unrealized loss, total in loss position (25,000) (63,000)    
Total Investments [Member]
        
Cash Equivalents, at Carrying Value [Abstract]        
Amortized Cost 20,722,000 19,510,000    
Gross Unrealized Gain 11,000 16,000    
Gross Unrealized (Loss) (34,000) (65,000)    
Fair Value $ 20,699,000 $ 19,461,000