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Investments and Fair Value Measurements - Cash, Cash Equivalents and Investments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Cash, cash equivalents and investments [Abstract]        
Cash $ 10,289,000 $ 22,337,000    
Cash equivalents [Abstract]        
Certificates of deposit 14,586,000 6,454,000    
Money market fund   23,000    
Total cash and cash equivalents 24,875,000 28,814,000 $ 24,961,000 $ 30,634,000
Amortized Cost 43,646,000 48,267,000    
Gross Unrealized Gain 433,000 712,000    
Gross Unrealized (Loss) (76,000) (42,000)    
Fair Value 44,003,000 48,937,000    
Contractual maturities on investments, amortized cost basis [Abstract]        
Due within 1 year 11,022,000 11,631,000    
Due after 1 through 5 years 7,749,000 7,822,000    
Investments, amortized cost 18,771,000 19,453,000    
Contractual maturities on investments, fair value basis [Abstract]        
Due within 1 year 11,437,000 12,340,000    
Due after 1 through 5 years 7,691,000 7,783,000    
Investments, fair value 19,128,000 20,123,000    
Proceeds from sales of available-for-sale investments     0  
Gross realized gains from sales of available-for-sale investments 859,000 1,263,000 $ 0  
GHI        
Contractual maturities on investments, fair value basis [Abstract]        
Unrealized gain, net of tax 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 18,771,000 19,453,000    
Gross Unrealized Gain 433,000 712,000    
Gross Unrealized (Loss) (76,000) (42,000)    
Fair Value 19,128,000 20,123,000    
Certificates of Deposit [Member]        
Cash equivalents [Abstract]        
Amortized Cost 9,795,000 10,195,000    
Gross Unrealized Gain 1,000 1,000    
Gross Unrealized (Loss) (13,000) (13,000)    
Fair Value 9,783,000 10,183,000    
Corporate Bonds [Member]        
Cash equivalents [Abstract]        
Amortized Cost 8,776,000 9,214,000    
Gross Unrealized Gain   1,000    
Gross Unrealized (Loss) (63,000) (29,000)    
Fair Value 8,713,000 9,186,000    
Corporate Equity Securities [Member]        
Cash equivalents [Abstract]        
Amortized Cost 200,000 44,000    
Gross Unrealized Gain 432,000 710,000    
Fair Value $ 632,000 $ 754,000