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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Marketable Securities |
Schedule for available-for-sale securities | The following is a summary of available-for-sale securities as of December 31, 2018 (in thousands):
| December 31, 2018
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value
Corporate debt securities | $ | 48,202 |  | $ | 12 |  | $ | (284) |  | $ | 47,930
Tax-exempt municipal securities |  | 22,858 |  |  | 45 |  |  | (34) |  |  | 22,869
Variable rate demand notes |  | 4,000 |  |  | — |  |  | — |  |  | 4,000
Total | $ | 75,060 |  | $ | 57 |  | $ | (318) |  | $ | 74,799
Schedule of maturities of marketable securities | The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2018 (in thousands):
|  | December 31, 2018
Due within one year | $ | 37,121
Due after one year through five years |  | 37,678
Total | $ | 74,799

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