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v3.20.1

Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Schedule for Available-for-Sale Securities | The following is a summary of available-for-sale securities as of March 31, 2020 (in thousands):
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Corporate debt securities | $ | 34,457 |  |  | $ | 62 |  |  | $ | (160 | ) |  | $ | 34,359 |
Tax-exempt municipal securities | 23,321 |  |  | 221 |  |  | (69 | ) |  | 23,473 |
Variable rate demand notes | 5,600 |  |  | — |  |  | — |  |  | 5,600 |
Total | $ | 63,378 |  |  | $ | 283 |  |  | $ | (229 | ) |  | $ | 63,432 |
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 |
Schedule of Maturities of Marketable Securities | The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2019 and March 31, 2020 (in thousands):
| December 31, 2019 |  | March 31, 2020
Due within one year | $ | 34,874 |  |  | $ | 26,842 |
Due after one year through five years | 36,633 |  |  | 36,590 |
Total | $ | 71,507 |  |  | $ | 63,432 |

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