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Marketable Securities | 6 Months Ended
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Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities All of the Company's marketable securities were available-for-sale and were classified based on their maturities. Short term investments are securities that original maturity or remaining maturity is greater than three months and not more than twelve months. The maturities of the long-term investments outstanding as of June 30, 2019 range from 15 to 17 months. 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 The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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