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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

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