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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Securities | The table below summarizes the marketable securities as of June 30, 2019 and December 31, 2018 (in thousands). Unrealized gains and losses on marketable securities are recorded in accumulated other comprehensive loss.
| June 30, 2019
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
Money market funds | $ | 6,294 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,294 |
Cash equivalents | 6,294 |  |  | — |  |  | — |  |  | 6,294 |
U.S. treasury securities | 77,526 |  |  | 65 |  |  | — |  |  | 77,591 |
Corporate bonds | 14,168 |  |  | 21 |  |  | — |  |  | 14,189 |
Short-term investments | 91,694 |  |  | 86 |  |  | — |  |  | 91,780 |
Corporate bonds | 5,254 |  |  | 8 |  |  | — |  |  | 5,262 |
Long-term investments | 5,254 |  |  | 8 |  |  | — |  |  | 5,262 |
Total marketable securities | $ | 103,242 |  |  | $ | 94 |  |  | $ | — |  |  | $ | 103,336 |
| December 31, 2018
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
U.S. treasury securities | $ | 1,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,000 |
Commercial paper | 6,635 |  |  | — |  |  | — |  |  | 6,635 |
Money market funds | 15,223 |  |  | — |  |  | — |  |  | 15,223 |
Cash equivalents | 22,858 |  |  | — |  |  | — |  |  | 22,858 |
U.S. treasury securities | 65,491 |  |  | 2 |  |  | (4 | ) |  | 65,489 |
Corporate bonds | 19,708 |  |  | 15 |  |  | (3 | ) |  | 19,720 |
Commercial paper | 11,894 |  |  | — |  |  | — |  |  | 11,894 |
Short-term investments | 97,093 |  |  | 17 |  |  | (7 | ) |  | 97,103 |
Total marketable securities | $ | 119,951 |  |  | $ | 17 |  |  | $ | (7 | ) |  | $ | 119,961 |

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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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