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Marketable Securities - Available-for-sale Securities by Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Summary of maturities, at par, of marketable securities    
2015 $ 6,507 $ 17,082
2016 10,521 10,040
2017 9,155 9,328
2018 12,079 4,778
2019 188  
Total 38,450 41,228
Certificates of deposit    
Summary of maturities, at par, of marketable securities    
2015 1,355 4,213
2016 2,492 1,501
2017 631 831
2018 3,800 2,149
2019 0  
Total 8,278 8,694
U.S. Treasury and agency notes    
Summary of maturities, at par, of marketable securities    
2015 419 1,176
2016 100 600
2017 959 1,209
2018 1,079 879
2019 188  
Total 2,745 3,864
Corporate notes    
Summary of maturities, at par, of marketable securities    
2015 3,653 9,588
2016 6,604 6,704
2017 6,625 6,498
2018 5,845 1,625
2019 0  
Total 22,727 24,415
Municipal notes    
Summary of maturities, at par, of marketable securities    
2015 1,080 2,105
2016 1,325 1,235
2017 940 790
2018 1,355 125
2019 0  
Total $ 4,700 $ 4,255