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Short-term and Long-term Investments | 9 Months Ended
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Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Short-term and Long-term Investments | Short-term and Long-term Investments The Company's investments are classified as available-for-sale. The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of September 30, 2022:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Aggregate Fair Value
U.S. government debt securities | $ | 63,400 |  |  | $ | — |  |  | $ | (1,236) |  |  | $ | 62,164 |
Certificates of deposit | 96 |  |  | — |  |  | — |  |  | 96 |
Total | $ | 63,496 |  |  | $ | — |  |  | $ | (1,236) |  |  | $ | 62,260 |
The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of December 31, 2021:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Aggregate Fair Value
U.S. government debt securities | $ | 121,036 |  |  | $ | — |  |  | $ | (331) |  |  | $ | 120,705 |
Certificates of deposit | 97 |  |  | — |  |  | — |  |  | 97 |
Total | $ | 121,133 |  |  | $ | — |  |  | $ | (331) |  |  | $ | 120,802 |
The estimated fair value of available-for-sale investments classified by their contractual maturities as of September 30, 2022 was:
Due within one year | $ | 62,260 |
After one year through two years | — |
Total | $ | 62,260 |
Changes in market interest rates and bond yields cause certain investments to fall below their cost basis, resulting in unrealized losses on 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 https://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 https://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 https://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 https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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