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Cash, Cash Equivalents and Investments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2011
Cash, cash equivalents and investments [Abstract]        
Cash $ 23,948,000 $ 10,289,000    
Cash equivalents [Abstract]        
Certificates of deposit 12,204,000 14,586,000    
Total cash and cash equivalents 36,152,000 24,875,000 $ 28,814,000 $ 24,961,000
Amortized Cost 53,678,000 43,646,000    
Gross Unrealized Gain 112,000 433,000    
Gross Unrealized (Loss) (67,000) (76,000)    
Fair Value 53,723,000 44,003,000    
Contractual maturities on investments, amortized cost basis [Abstract]        
Due within 1 year 11,325,000 11,022,000    
Due after 1 through 5 years 6,201,000 7,749,000    
Investments, amortized cost 17,526,000 18,771,000    
Contractual maturities on investments, fair value basis [Abstract]        
Due within 1 year 11,415,000 11,437,000    
Due after 1 through 5 years 6,156,000 7,691,000    
Investments, fair value 17,571,000 19,128,000    
Investments held 6,599,000 7,948,000    
Gross realized gains from sales of available-for-sale investments 429,000 859,000 1,263,000  
GHI        
Contractual maturities on investments, fair value basis [Abstract]        
Realized gain 581,000      
Available-for-sale investments, expenses 152,000      
Gross realized gains from sales of available-for-sale investments 429,000      
Unrealized gain, net of tax 111,000 432,000    
IntelliEpi        
Contractual maturities on investments, fair value basis [Abstract]        
Proceeds from sales of available-for-sale investments   902,000 1,300,000  
Investments held 0      
Available-for-sale investments, expenses   43,000 82,000  
Gross realized gains from sales of available-for-sale investments   859,000 $ 1,300,000  
Auction Rate Securities [Member]        
Contractual maturities on investments, fair value basis [Abstract]        
Investments held 0      
Total Investments [Member]        
Cash equivalents [Abstract]        
Amortized Cost 17,526,000 18,771,000    
Gross Unrealized Gain 112,000 433,000    
Gross Unrealized (Loss) (67,000) (76,000)    
Fair Value 17,571,000 19,128,000    
Certificates of Deposit [Member]        
Cash equivalents [Abstract]        
Amortized Cost 8,999,000 9,795,000    
Gross Unrealized Gain 1,000 1,000    
Gross Unrealized (Loss) (20,000) (13,000)    
Fair Value 8,980,000 9,783,000    
Corporate Bonds [Member]        
Cash equivalents [Abstract]        
Amortized Cost 8,479,000 8,776,000    
Gross Unrealized (Loss) (47,000) (63,000)    
Fair Value 8,432,000 8,713,000    
Corporate Equity Securities [Member]        
Cash equivalents [Abstract]        
Amortized Cost 48,000 200,000    
Gross Unrealized Gain 111,000 432,000    
Fair Value $ 159,000 $ 632,000