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Available-for-Sale-Securities (Tables) | 9 Months Ended
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Sep. 30, 2020
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, 2020 |  | December 31, 2019
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate debt securities | $ | 13,506 |  |  | $ | — |  |  | $ | (11) |  |  | $ | 13,495 |  |  | $ | 11,673 |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | 11,675 |
Money market funds | 15,481 |  |  | — |  |  | — |  |  | 15,481 |  |  | 11,093 |  |  | — |  |  | — |  |  | 11,093 |
Municipal debt securities | 8,613 |  |  | — |  |  | (1) |  |  | 8,612 |  |  | — |  |  | — |  |  | — |  |  | — |
Sovereign government securities | 196 |  |  | — |  |  | — |  |  | 196 |  |  | — |  |  | — |  |  | — |  |  | — |
Total | $ | 37,796 |  |  | $ | — |  |  | $ | (12) |  |  | $ | 37,784 |  |  | $ | 22,766 |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | 22,768 |
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, 2020 |  | December 31, 2019
Cash and cash equivalents | $ | 18,671 |  |  | $ | 11,643 |
Marketable securities | 19,113 |  |  | 11,125 |
Total | $ | 37,784 |  |  | $ | 22,768 |
Investments Classified by Contractual Maturity Date | The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
| September 30, 2020
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 37,796 |  |  | $ | 37,784 |
Greater than one year | — |  |  | — |
Total | $ | 37,796 |  |  | $ | 37,784 |

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