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v3.20.2

Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2020 (in thousands):
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Corporate debt securities | $ | 22,865 |  |  | $ | 485 |  |  | $ | — |  |  | $ | 23,350 |
Tax-exempt municipal securities | 21,907 |  |  | 275 |  |  | (12) |  |  | 22,170 |
Variable rate demand notes | 5,600 |  |  | — |  |  | — |  |  | 5,600 |
Total | $ | 50,372 |  |  | $ | 760 |  |  | $ | (12) |  |  | $ | 51,120 |
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 September 30, 2020 (in thousands):
| December 31, 2019 |  | September 30, 2020
Due within one year | $ | 34,874 |  |  | $ | 20,457 |
Due after one year through five years | 36,633 |  |  | 30,663 |
Total | $ | 71,507 |  |  | $ | 51,120 |
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, 2019 and 2020 (in thousands):
| For the three months ended September 30, |  | For the nine months ended September 30,
| 2019 |  | 2020 |  | 2019 |  | 2020
Maturities of marketable securities | $ | 10,300 |  |  | $ | 3,999 |  |  | $ | 32,860 |  |  | $ | 21,404 |
Sales of marketable securities | — |  |  | — |  |  | — |  |  | 1,464 |
Total | $ | 10,300 |  |  | $ | 3,999 |  |  | $ | 32,860 |  |  | $ | 22,868 |

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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=121645371&loc=d3e27357-111563 + Details
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