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Marketable Securities | 12 Months Ended
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Dec. 31, 2019
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | 3. Marketable Securities As of December 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 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):
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
Description |  | Cost |  |  | Gains |  |  | Losses |  |  | 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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- 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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