Quarterly report pursuant to Section 13 or 15(d)

Cash Equivalents and Investments (Details)

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Cash Equivalents and Investments (Details) (USD $)
Sep. 30, 2013
Security
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Cash Equivalents and Investments [Abstract]        
Number of securities held 6      
Fair value of securities $ 1,300,000      
Cash and cash equivalents [Abstract]        
Cost or amortized cost 65,183,000 29,576,000 32,873,000 54,087,000
Contractual maturities of marketable fixed-income securities [Abstract]        
Due within one year, amortized cost 8,280,000      
Due after one year through five years, amortized cost 9,922,000      
Due after five year through ten years, amortized cost 0      
Total, Amortized Cost 18,202,000      
Due within one year, estimated fair value 8,355,000      
Due after one year through five years, estimated fair value 10,006,000      
Due after five year through ten years, estimated fair value 0      
Total, Estimated Fair Value 18,361,000      
Cash and cash equivalents [Member]
       
Cash and cash equivalents [Abstract]        
Cost or amortized cost 65,183,000 29,576,000    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses 0 0    
Estimated Fair Value 65,183,000 29,576,000    
Short-term investments [Member]
       
Cash and cash equivalents [Abstract]        
Cost or amortized cost 8,280,000 6,253,000    
Gross Unrealized Gains 76,000 70,000    
Gross Unrealized Losses (1,000) 0    
Estimated Fair Value 8,355,000 6,323,000    
Long-term investments [Member]
       
Cash and cash equivalents [Abstract]        
Cost or amortized cost 9,922,000 10,539,000    
Gross Unrealized Gains 89,000 190,000    
Gross Unrealized Losses (5,000) (9,000)    
Estimated Fair Value 10,006,000 10,720,000    
Cash, cash equivalents and investments [Member]
       
Cash and cash equivalents [Abstract]        
Cost or amortized cost 83,385,000 46,368,000    
Gross Unrealized Gains 165,000 260,000    
Gross Unrealized Losses (6,000) (9,000)    
Estimated Fair Value 83,544,000 46,619,000    
Cash [Member] | Cash and cash equivalents [Member]
       
Cash and cash equivalents [Abstract]        
Cost or amortized cost 39,447,000 7,043,000    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses 0 0    
Estimated Fair Value 39,447,000 7,043,000    
Money market [Member] | Cash and cash equivalents [Member]
       
Cash and cash equivalents [Abstract]        
Cost or amortized cost 25,736,000 22,533,000    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses 0 0    
Estimated Fair Value 25,736,000 22,533,000    
Corporate notes and bonds [Member] | Short-term investments [Member]
       
Cash and cash equivalents [Abstract]        
Cost or amortized cost 8,280,000 5,248,000    
Gross Unrealized Gains 76,000 66,000    
Gross Unrealized Losses (1,000) 0    
Estimated Fair Value 8,355,000 5,314,000    
Corporate bonds and asset backed securities [Member] | Long-term investments [Member]
       
Cash and cash equivalents [Abstract]        
Cost or amortized cost 9,922,000 10,539,000    
Gross Unrealized Gains 89,000 190,000    
Gross Unrealized Losses (5,000) (9,000)    
Estimated Fair Value 10,006,000 10,720,000    
U.S. government and agency securities [Member] | Short-term investments [Member]
       
Cash and cash equivalents [Abstract]        
Cost or amortized cost   1,005,000    
Gross Unrealized Gains   4,000    
Gross Unrealized Losses   0    
Estimated Fair Value   $ 1,009,000