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Marketable Securities - Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Summary of maturities, at par, of marketable securities |  |
2019 | $ 32,448 | $ 43,667
2020 | 27,672 | 20,123
2021 | 400 | 400
Total | 60,520 | 64,190
Certificates of deposit |  |
Summary of maturities, at par, of marketable securities |  |
2019 | 2,212 | 2,311
2020 | 1,799 | 1,799
2021 | 0 | 0
Total | 4,011 | 4,110
U.S. Treasury and agency notes |  |
Summary of maturities, at par, of marketable securities |  |
2019 | 13,414 | 17,574
2020 | 10,173 | 9,174
2021 | 0 | 0
Total | 23,587 | 26,748
Corporate notes |  |
Summary of maturities, at par, of marketable securities |  |
2019 | 11,871 | 18,671
2020 | 13,700 | 7,150
2021 | 400 | 400
Total | 25,971 | 26,221
Municipal notes |  |
Summary of maturities, at par, of marketable securities |  |
2019 | 4,951 | 5,111
2020 | 2,000 | 2,000
2021 | 0 | 0
Total | $ 6,951 | $ 7,111

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