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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments Debt And Equity Securities [Abstract] |
Schedule of Fair Value Marketable Securities By Type of Security | As of March 31, 2019, the fair value of marketable securities by type of security was as follows (in thousands):
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
Description |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. government agency securities and treasuries |  | $ | 135,878 |  |  | $ | 32 |  |  | $ | — |  |  | $ | 135,910 |
Total |  | $ | 135,878 |  |  | $ | 32 |  |  | $ | — |  |  | $ | 135,910 |
As of December 31, 2018, the fair value of marketable securities by type of security was as follows (in thousands):
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
Description |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. government agency treasuries and securities |  | $ | 101,027 |  |  | $ | — |  |  | $ | 41 |  |  | $ | 100,986 |
Total |  | $ | 101,027 |  |  | $ | — |  |  | $ | 41 |  |  | $ | 100,986 |
Schedule of Fair Value and Amortized Cost of Company's Available-for-Sale Securities by Contractual Maturity | 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, 2019 |
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
Due in one year or less |  | $ | 135,878 |  |  | $ | 135,910 |
Total |  | $ | 135,878 |  |  | $ | 135,910 |
|  | December 31, 2018 |
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
Due in one year or less |  | $ | 101,027 |  |  | $ | 100,986 |
Total |  | $ | 101,027 |  |  | $ | 100,986 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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