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Marketable Securities - Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Summary of maturities, at par, of marketable securities |  |
2016 | $ 6,828 | $ 8,159
2017 | 9,330 | 8,855
2018 | 13,213 | 13,006
2019 | 2,688 | 2,238
Total | 32,059 | 32,258
Certificates of deposit |  |
Summary of maturities, at par, of marketable securities |  |
2016 | 1,594 | 2,492
2017 | 631 | 631
2018 | 4,510 | 4,510
2019 | 169 | 169
Total | 6,904 | 7,802
U.S. Treasury and agency notes |  |
Summary of maturities, at par, of marketable securities |  |
2016 | 100 | 100
2017 | 1,234 | 759
2018 | 579 | 579
2019 | 143 | 188
Total | 2,056 | 1,626
Corporate notes |  |
Summary of maturities, at par, of marketable securities |  |
2016 | 4,159 | 4,572
2017 | 6,525 | 6,525
2018 | 6,669 | 6,462
2019 | 2,301 | 1,881
Total | 19,654 | 19,440
Municipal notes |  |
Summary of maturities, at par, of marketable securities |  |
2016 | 975 | 995
2017 | 940 | 940
2018 | 1,455 | 1,455
2019 | 75 | 0
Total | $ 3,445 | $ 3,390

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