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Marketable Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,127  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (26)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,966  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (24)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,093  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (50)  
Due within one year, Amortized Cost 7,327  
Due within one year, Estimated fair value 7,314  
Due after one year through five years, Amortized Cost 17,611  
Due after one year through five years, Estimated fair value 17,771  
Due after five years through ten years, Amortized Cost 361  
Due after five years through ten years, Estimated fair value 362  
Total available-for-sale securities, Amortized Cost 25,299 $ 26,096
Total available-for-sale securities, Estimated fair value 25,447 $ 26,156
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,127  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (26)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,533  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (22)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,660  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (48)  
Total available-for-sale securities, Amortized Cost 19,220  
Total available-for-sale securities, Estimated fair value 19,334  
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 433  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 433  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (2)  
Total available-for-sale securities, Amortized Cost 6,079  
Total available-for-sale securities, Estimated fair value $ 6,113