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Investments and Fair Value Measurements (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Cash, cash equivalents and investments [Abstract]            
Cash $ 17,337,000   $ 17,337,000   $ 22,337,000  
Cash equivalents [Abstract]            
Certificates of deposit, amortized cost [1] 11,303,000   11,303,000   6,454,000  
Certificates of deposit, gross unrealized gain [1]     0   0  
Certificates of deposit, gross unrealized loss [1]     0   0  
Certificates of deposit, fair value [1] 11,303,000   11,303,000   6,454,000  
Money market fund 0   0   23,000  
Total cash and cash equivalents 28,640,000 $ 26,307,000 28,640,000 $ 26,307,000 28,814,000 $ 24,961,000
Amortized Cost 45,951,000   45,951,000   48,267,000  
Gross Unrealized Gain 376,000   376,000   712,000  
Gross Unrealized (Loss) (56,000)   (56,000)   (42,000)  
Fair Value 46,271,000   46,271,000   48,937,000  
Contractual maturities on investments, amortized cost basis [Abstract]            
Due within 1 year 3,560,000   3,560,000   11,631,000  
Due after 1 through 5 years 13,751,000   13,751,000   7,822,000  
Investments, amortized cost 17,311,000   17,311,000   19,453,000  
Contractual maturities on investments, fair value basis [Abstract]            
Due within 1 year 3,932,000   3,932,000   12,340,000  
Due after 1 through 5 years 13,699,000   13,699,000   7,783,000  
Investments, fair value 17,631,000   17,631,000   20,123,000  
Proceeds from sales of available-for-sale investments 515,000 346,000 902,000 346,000    
Available-for-sale investments, expenses 23,000 22,000 43,000 22,000    
Gross realized gains from sales of available-for-sale investments 492,000 $ 324,000 859,000 $ 324,000    
Unrealized gain, net of tax     375,000      
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]            
Fair value, in loss position less than twelve months 15,376,000   15,376,000   8,262,000  
Gross unrealized loss, in loss position less than twelve months     (55,000)   (40,000)  
Fair value, in loss position greater than twelve months 1,199,000   1,199,000   4,309,000  
Gross unrealized loss, in loss position greater than twelve months     (1,000)   (2,000)  
Fair value, total in loss position 16,575,000   16,575,000   12,571,000  
Gross unrealized loss, total in loss position     (56,000)   (42,000)  
Minority Investments [Abstract]            
Minority investments in unconsolidated privately-held companies         200,000  
Other Assets [Member]            
Minority Investments [Abstract]            
Investments in privately-held companies 12,600,000   12,600,000   12,100,000  
Minority investments in unconsolidated privately-held companies         200,000  
Certificates of Deposit [Member]            
Cash equivalents [Abstract]            
Amortized Cost [2] 8,105,000   8,105,000   10,195,000  
Gross Unrealized Gain [2] 1,000   1,000   1,000  
Gross Unrealized (Loss) [2] (16,000)   (16,000)   (13,000)  
Fair Value [2] 8,090,000   8,090,000   10,183,000  
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]            
Fair value, in loss position less than twelve months 6,410,000   6,410,000   4,492,000  
Gross unrealized loss, in loss position less than twelve months     (15,000)   (13,000)  
Fair value, in loss position greater than twelve months 1,199,000   1,199,000   0  
Gross unrealized loss, in loss position greater than twelve months     (1,000)   0  
Fair value, total in loss position 7,609,000   7,609,000   4,492,000  
Gross unrealized loss, total in loss position     (16,000)   (13,000)  
Corporate Bonds [Member]            
Cash equivalents [Abstract]            
Amortized Cost 9,006,000   9,006,000   9,214,000  
Gross Unrealized Gain 0   0   1,000  
Gross Unrealized (Loss) (40,000)   (40,000)   (29,000)  
Fair Value 8,966,000   8,966,000   9,186,000  
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]            
Fair value, in loss position less than twelve months 8,966,000   8,966,000   3,770,000  
Gross unrealized loss, in loss position less than twelve months     (40,000)   (27,000)  
Fair value, in loss position greater than twelve months 0   0   4,309,000  
Gross unrealized loss, in loss position greater than twelve months     0   (2,000)  
Fair value, total in loss position 8,966,000   8,966,000   8,079,000  
Gross unrealized loss, total in loss position     (40,000)   (29,000)  
Corporate Equity Securities [Member]            
Cash equivalents [Abstract]            
Amortized Cost 200,000   200,000   44,000  
Gross Unrealized Gain 375,000   375,000   710,000  
Gross Unrealized (Loss) 0   0   0  
Fair Value 575,000   575,000   754,000  
Total Investments [Member]            
Cash equivalents [Abstract]            
Amortized Cost 17,311,000   17,311,000   19,453,000  
Gross Unrealized Gain 376,000   376,000   712,000  
Gross Unrealized (Loss) (56,000)   (56,000)   (42,000)  
Fair Value $ 17,631,000   $ 17,631,000   $ 20,123,000  
[1] Certificate of deposit with original maturities of less than 90 days.
[2] Certificate of deposit with original maturities of more than 90 days.