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Available-for-Sale-Securities | 3 Months Ended
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Mar. 31, 2021
Debt Securities, Available-for-sale [Abstract] |
Available-for-Sale-Securities | Available-for-Sale-Securities 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):
| March 31, 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 | $ | 59,937 |  |  | $ | — |  |  | $ | (61) |  |  | $ | 59,876 |  |  | $ | 8,406 |  |  | $ | — |  |  | $ | (7) |  |  | $ | 8,399 |
Money market funds | 18,044 |  |  | — |  |  | — |  |  | 18,044 |  |  | 7,591 |  |  | — |  |  | — |  |  | 7,591 |
Municipal debt securities | 29,016 |  |  | — |  |  | (12) |  |  | 29,004 |  |  | 14,753 |  |  | — |  |  | (6) |  |  | 14,747 |
Total | $ | 106,997 |  |  | $ | — |  |  | $ | (73) |  |  | $ | 106,924 |  |  | $ | 30,750 |  |  | $ | — |  |  | $ | (13) |  |  | $ | 30,737 |
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):
| March 31, 2021 |  | December 31, 2020
Cash and cash equivalents | $ | 24,157 |  |  | $ | 12,676 |
Marketable securities | 82,767 |  |  | 18,061 |
Total | $ | 106,924 |  |  | $ | 30,737 |
The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
| March 31, 2021
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 106,997 |  |  | $ | 106,924 |
Greater than one year | — |  |  | — |
Total | $ | 106,997 |  |  | $ | 106,924 |

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- References No definition available. + Details
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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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