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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2022
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, 2022 (in thousands):
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Tax-exempt municipal securities | $ | 18,572 |  |  | $ | 31 |  |  | $ | (232) |  |  | $ | 18,371 |
Corporate debt securities | 9,758 |  |  | 5 |  |  | (72) |  |  | 9,691 |
Total | $ | 28,330 |  |  | $ | 36 |  |  | $ | (304) |  |  | $ | 28,062 |
The following is a summary of available-for-sale securities as of December 31, 2021 (in thousands):
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Tax-exempt municipal securities | $ | 18,546 |  |  | $ | 271 |  |  | $ | — |  |  | $ | 18,817 |
Corporate debt securities | 10,898 |  |  | 163 |  |  | — |  |  | 11,061 |
Total | $ | 29,444 |  |  | $ | 434 |  |  | $ | — |  |  | $ | 29,878 |
Schedule of Maturities of Marketable Securities | The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2021 and March 31, 2022 (in thousands):
| December 31, 2021 |  | March 31, 2022
Due within one year | $ | 6,501 |  |  | $ | 6,785 |
Due after one year through five years | 23,377 |  |  | 21,277 |
Total | $ | 29,878 |  |  | $ | 28,062 |
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 months ended March 31, 2021 and 2022 (in thousands):
| For the three months ended March 31, |  |
| 2021 |  | 2022 |  |  |  |
Maturities of marketable securities | $ | 1,930 |  |  | $ | 1,100 |  |  |  |  |
Sales of marketable securities | — |  |  | — |  |  |  |  |
Total | $ | 1,930 |  |  | $ | 1,100 |  |  |  |  |

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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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