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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable securities | The following table summarizes the proceeds from the maturities of available-for-sale securities for the three and nine months ended September 30, 2018 and 2019 (in thousands):
| For the three months ended September 30, |  | For the nine months ended September 30,
| 2018 |  | 2019 |  | 2018 |  | 2019
Maturities of marketable securities | $ | 5,842 |  |  | $ | 10,300 |  |  | $ | 5,842 |  |  | $ | 32,860 |
Total | $ | 5,842 |  |  | $ | 10,300 |  |  | $ | 5,842 |  |  | $ | 32,860 |
Schedule for Available-for-Sale Securities | The following is a summary of available-for-sale securities as of September 30, 2019 (in thousands):
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Corporate debt securities | $ | 40,148 |  |  | $ | 207 |  |  | $ | (6 | ) |  | $ | 40,349 |
Tax-exempt municipal securities | 13,936 |  |  | 131 |  |  | (29 | ) |  | 14,038 |
Variable rate demand notes | 5,600 |  |  | — |  |  | — |  |  | 5,600 |
Total | $ | 59,684 |  |  | $ | 338 |  |  | $ | (35 | ) |  | $ | 59,987 |
The following is a summary of available-for-sale securities as of December 31, 2018 (in thousands):
| 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 and September 30, 2019 (in thousands):
| December 31, 2018 |  | September 30, 2019
Due within one year | $ | 37,121 |  |  | $ | 33,455 |
Due after one year through five years | 37,678 |  |  | 26,532 |
Total | $ | 74,799 |  |  | $ | 59,987 |

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