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Marketable Securities - Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Summary of maturities, at par, of marketable securities |  |
2018 | $ 20,227 | $ 6,921
2019 | 30,297 | 13,571
2020 | 20,423 | 5,773
2021 | 0 | 0
Total | 70,947 | 26,265
Certificates of deposit |  |
Summary of maturities, at par, of marketable securities |  |
2018 | 4,306 | 531
2019 | 2,311 | 4,306
2020 | 1,799 | 324
2021 | 0 | 0
Total | 8,416 | 5,161
U.S. Treasury and agency notes |  |
Summary of maturities, at par, of marketable securities |  |
2018 | 6,399 | 1,234
2019 | 14,599 | 444
2020 | 9,171 | 142
2021 | 0 | 0
Total | 30,169 | 1,820
Corporate notes |  |
Summary of maturities, at par, of marketable securities |  |
2018 | 7,954 | 4,316
2019 | 6,430 | 7,133
2020 | 6,450 | 4,232
2021 | 0 | 0
Total | 20,834 | 15,681
Municipal notes |  |
Summary of maturities, at par, of marketable securities |  |
2018 | 1,568 | 840
2019 | 6,957 | 1,688
2020 | 3,003 | 1,075
2021 | 0 | 0
Total | $ 11,528 | $ 3,603

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