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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule for Available-for-Sale Securities | The following is a summary of available-for-sale securities as of September 30, 2021 (in thousands):
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Tax-exempt municipal securities | $ | 18,520 |  |  | $ | 465 |  |  | $ | — |  |  | $ | 18,985 |
Corporate debt securities | 10,940 |  |  | 274 |  |  | — |  |  | 11,214 |
Total | $ | 29,460 |  |  | $ | 739 |  |  | $ | — |  |  | $ | 30,199 |
The following is a summary of available-for-sale securities as of December 31, 2020 (in thousands):
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Tax-exempt municipal securities | $ | 19,924 |  |  | $ | 365 |  |  | $ | — |  |  | $ | 20,289 |
Corporate debt securities | 17,086 |  |  | 452 |  |  | — |  |  | 17,538 |
Total | $ | 37,010 |  |  | $ | 817 |  |  | $ | — |  |  | $ | 37,827 |
Schedule of Maturities of Marketable Securities | The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2020 and September 30, 2021 (in thousands):
| December 31, 2020 |  | September 30, 2021
Due within one year | $ | 7,557 |  |  | $ | 2,632 |
Due after one year through five years | 30,270 |  |  | 27,567 |
Total | $ | 37,827 |  |  | $ | 30,199 |
Schedule of Proceeds from the Maturities of Available-for-Sale Securities | The following table summarizes the proceeds from the maturities and sales of available-for-sale securities for the three and nine months ended September 30, 2020 and 2021 (in thousands):
| For the three months ended September 30, |  | For the nine months ended September 30, |  |
| 2020 |  | 2021 |  | 2020 |  | 2021 |  |  |  |
Maturities of marketable securities | $ | 3,999 |  |  | $ | 1,900 |  |  | $ | 21,404 |  |  | $ | 7,495 |  |  |  |  |
Sales of marketable securities | — |  |  | 1,805 |  |  | 1,464 |  |  | 1,805 |  |  |  |  |
Total | $ | 3,999 |  |  | $ | 3,705 |  |  | $ | 22,868 |  |  | $ | 9,300 |  |  |  |  |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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