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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Investments Debt And Equity Securities [Abstract] |
Fair Value of Available for Sale Marketable Securities | At September 30, 2019 and December 31, 2018, the fair value of marketable securities, which were all classified as available for sale, included the following (in thousands):
|  | September 30, 2019 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 34,905 |  |  | $ | 11 |  |  | $ | (4 | ) |  | $ | 34,912 |
Government-sponsored enterprise debt securities |  |  | 3,811 |  |  |  | 1 |  |  |  | — |  |  |  | 3,812 |
Total |  | $ | 38,716 |  |  | $ | 12 |  |  | $ | (4 | ) |  | $ | 38,724 |
|  | December 31, 2018 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 31,521 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 31,498 |
Government-sponsored enterprise debt securities |  |  | 2,999 |  |  |  | — |  |  |  | — |  |  |  | 2,999 |
Total |  | $ | 34,520 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 34,497 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- References No definition available. + Details
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