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Available-for-Sale-Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Debt Securities, Available-for-sale [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):
| September 30, 2021 |  | December 31, 2020
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate debt securities | $ | 60,903 |  |  | $ | 3 |  |  | $ | (61) |  |  | $ | 60,845 |  |  | $ | 8,406 |  |  | $ | — |  |  | $ | (7) |  |  | $ | 8,399 |
Money market funds | 9,600 |  |  | — |  |  | — |  |  | 9,600 |  |  | 7,591 |  |  | — |  |  | — |  |  | 7,591 |
Municipal debt securities | 26,539 |  |  | — |  |  | (7) |  |  | 26,532 |  |  | 14,753 |  |  | — |  |  | (6) |  |  | 14,747 |
Total | $ | 97,042 |  |  | $ | 3 |  |  | $ | (68) |  |  | $ | 96,977 |  |  | $ | 30,750 |  |  | $ | — |  |  | $ | (13) |  |  | $ | 30,737 |
Schedule of Marketable Securities | Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale securities in our Consolidated Balance Sheets (in thousands):
| September 30, 2021 |  | December 31, 2020
Cash equivalents | $ | 9,600 |  |  | $ | 12,676 |
Marketable securities | 87,377 |  |  | 18,061 |
Total | $ | 96,977 |  |  | $ | 30,737 |
Investments Classified by Contractual Maturity Date | The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
| September 30, 2021
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 96,979 |  |  | $ | 96,914 |
Greater than one year | 63 |  |  | 63 |
Total | $ | 97,042 |  |  | $ | 96,977 |

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