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Investments, Available-for-Sale | 9 Months Ended
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Sep. 30, 2021
Investments Debt And Equity Securities [Abstract] |
Investments, Available-for-Sale | 6. Investments, Available-for-Sale The Company’s investment policy defines allowable investments and establishes guidelines relating to credit quality, diversification, and maturities of its investments to preserve principal and maintain liquidity. In accordance with the Company’s investment policy, it has invested funds in available-for-sale investments as of September 30, 2021 and December 31, 2020. The Company's available-for-sale investments consisted of the following (in thousands):
September 30, 2021 |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
U.S. treasury securities |  | $ | 47,656 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 47,657 |
Certificates of deposit |  |  | 736 |  |  |  | — |  |  |  | — |  |  |  | 736 |
Short-term investments, available-for-sale |  | $ | 48,392 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 48,393 |
U.S. treasury securities |  | $ | 6,006 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 6,003 |
Certificates of deposit |  |  | 953 |  |  |  | — |  |  |  | — |  |  |  | 953 |
Investments, available-for-sale |  | $ | 6,959 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 6,956 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 215,185 |  |  | $ | — |  |  | $ | (31 | ) |  | $ | 215,154 |
Short-term investments, available-for-sale |  | $ | 215,185 |  |  | $ | — |  |  | $ | (31 | ) |  | $ | 215,154 |
The Company has determined that there were no material declines in fair value of its investments due to credit-related factors as of September 30, 2021 and December 31, 2020. Credit loss is limited due to the nature of the investments.

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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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