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Marketable Securities | 3 Months Ended | 12 Months Ended
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Mar. 31, 2020 | Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |  |
Marketable Securities | 3. Marketable Securities As of March 31, 2020, the fair value of marketable securities by type of security was as follows (in thousands):
Description |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. government agency securities and treasuries |  | $ | 15,079 |  |  | $ | 32 |  |  | $ | — |  |  | $ | 15,111 |
Total |  | $ | 15,079 |  |  | $ | 32 |  |  | $ | — |  |  | $ | 15,111 |
As of December 31, 2019, the fair value of marketable securities by type of security was as follows (in thousands):
Description |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. government agency treasuries and securities |  | $ | 57,650 |  |  | $ | 49 |  |  | $ | — |  |  | $ | 57,699 |
Total |  | $ | 57,650 |  |  | $ | 49 |  |  | $ | — |  |  | $ | 57,699 |
The estimated fair value and amortized cost of the Company’s available-for-sale securities by contractual maturity are summarized as follows (in thousands):
|  | March 31, 2020 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 15,079 |  |  | $ | 15,111 |
Total |  | $ | 15,079 |  |  | $ | 15,111 |
|  | December 31, 2019 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 57,650 |  |  | $ | 57,699 |
Total |  | $ | 57,650 |  |  | $ | 57,699 |
| 3. Marketable Securities As of December 31, 2019, the fair value of marketable securities by type of security was as follows (in thousands):
Description |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. government agency treasuries and securities |  | $ | 57,650 |  |  | $ | 49 |  |  | $ | — |  |  | $ | 57,699 |
Total |  | $ | 57,650 |  |  | $ | 49 |  |  | $ | — |  |  | $ | 57,699 |
As of December 31, 2018, the fair value of marketable securities by type of security was as following (in thousands):
Description |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. government agency treasuries and securities |  | $ | 101,027 |  |  | $ | 4 |  |  | $ | (45 | ) |  | $ | 100,986 |
Total |  | $ | 101,027 |  |  | $ | 4 |  |  | $ | (45 | ) |  | $ | 100,986 |
The estimated fair value and amortized cost of the Company’s available-for-sale securities by contractual maturity are summarized as follows:
|  | December 31, 2019 |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 57,650 |  |  | $ | 57,699 |
Total |  | $ | 57,650 |  |  | $ | 57,699 |
|  | December 31, 2018 |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 101,027 |  |  | $ | 100,986 |
Total |  | $ | 101,027 |  |  | $ | 100,986 |

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