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v3.19.3.a.u2

Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Schedule for Available-for-Sale Securities | The following is a summary of available-for-sale securities as of December 31, 2019 (in thousands):
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Corporate debt securities | $ | 42,584 |  |  | $ | 165 |  |  | $ | (40 | ) |  | $ | 42,709 |
Tax-exempt municipal securities | 23,301 |  |  | 112 |  |  | (215 | ) |  | 23,198 |
Variable rate demand notes | 5,600 |  |  | — |  |  | — |  |  | 5,600 |
Total | $ | 71,485 |  |  | $ | 277 |  |  | $ | (255 | ) |  | $ | 71,507 |
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 2019 (in thousands):
| December 31, 2018 |  | December 31, 2019
Due within one year | $ | 37,121 |  |  | $ | 34,874 |
Due after one year through five years | 37,678 |  |  | 36,633 |
Total | $ | 74,799 |  |  | $ | 71,507 |

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