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Marketable Securities - Available-for-sale Securities by Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Summary of maturities, at par, of marketable securities    
2015 $ 8,159 $ 17,082
2016 8,855 10,040
2017 13,006 9,328
2018 2,238 4,778
Total 32,258 41,228
Certificates of deposit    
Summary of maturities, at par, of marketable securities    
2015 2,492 4,213
2016 631 1,501
2017 4,510 831
2018 169 2,149
Total 7,802 8,694
U.S. Treasury and agency notes    
Summary of maturities, at par, of marketable securities    
2015 100 1,176
2016 759 600
2017 579 1,209
2018 188 879
Total 1,626 3,864
Corporate notes    
Summary of maturities, at par, of marketable securities    
2015 4,572 9,588
2016 6,525 6,704
2017 6,462 6,498
2018 1,881 1,625
Total 19,440 24,415
Municipal notes    
Summary of maturities, at par, of marketable securities    
2015 995 2,105
2016 940 1,235
2017 1,455 790
2018 0 125
Total $ 3,390 $ 4,255