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Short-term Investments | 12 Months Ended
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Dec. 31, 2019
Investments Debt And Equity Securities [Abstract] |
Short-term Investments |
3. | Short-term Investments
The following table summarizes the held-to-maturity securities held at December 31, 2019 and 2018 (in thousands):
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
As of December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 1,996 |  |  | $ | 15 |  |  | $ | (14 | ) |  | $ | 1,997 |
Commercial paper |  |  | 998 |  |  |  | — |  |  |  | — |  |  |  | 998 |
Overnight repurchase agreement |  |  | 3,500 |  |  |  | — |  |  |  | — |  |  |  | 3,500 |
Total short-term investments |  | $ | 6,494 |  |  | $ | 15 |  |  | $ | (14 | ) |  | $ | 6,495 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
As of December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 14,946 |  |  | $ | 14 |  |  | $ | (15 | ) |  | $ | 14,945 |
Commercial paper |  |  | 8,772 |  |  |  | — |  |  |  | — |  |  |  | 8,772 |
Overnight repurchase agreement |  |  | 9,000 |  |  |  | — |  |  |  | — |  |  |  | 9,000 |
Total short-term investments |  | $ | 32,718 |  |  | $ | 14 |  |  | $ | (15 | ) |  | $ | 32,717 |
As of December 31, 2019, the Company has $6.5 million of held-to-maturity investments with contractual maturities less than one year. The gross unrealized gains and losses for the Company's commercial paper and overnight repurchase agreement are not significant. The Company carries short-term investments at amortized cost. The fair value of the short-term investments is determined based on “Level 1” inputs, which consist of quoted prices in active markets for identical assets.

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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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