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Short-Term Investments | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Short-Term Investments | 4. SHORT-TERM INVESTMENTS Short-term investments, which are classified as available-for-sale, consisted of the following:
December 31, 2022 |  | Amortized Cost Basis |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Fair Values |
|  | (in thousands) |
Treasury notes |  | $ | 27,173 |  |  | $ | — |  |  | $ | (14 | ) |  | $ | 27,159 |
Treasury bills |  |  | 59,326 |  |  |  | 10 |  |  |  | (2 | ) |  |  | 59,334 |
Commercial paper |  |  | 134,375 |  |  |  | — |  |  |  | — |  |  |  | 134,375 |
Corporate debt securities |  |  | 58,795 |  |  |  | 13 |  |  |  | (55 | ) |  |  | 58,753 |
Agency bonds |  |  | 4,781 |  |  |  | 17 |  |  |  | 0 |  |  |  | 4,798 |
Total short-term investments |  | $ | 284,450 |  |  | $ | 40 |  |  | $ | (71 | ) |  | $ | 284,419 |
December 31, 2021 |  | Amortized Cost Basis |  |  | Unrealized Loss |  |  | Fair Values |
|  | (in thousands) |
Commercial paper |  | $ | 33,979 |  |  | $ | (1 | ) |  | $ | 33,978 |
Corporate debt securities |  |  | 11,953 |  |  |  | (4 | ) |  |  | 11,949 |
Total short-term investments |  |  | 45,932 |  |  |  | (5 | ) |  |  | 45,927 |
As of December 31, 2022 and 2021, all investments had contractual maturities within one year. The amortized cost of available-for-sale securities is adjusted for amortization of premiums and accretion of discounts until maturity. Such amortization and accretion are included in interest income. There were no realized gains and losses recognized during the years ended December 31, 2022 and 2021. The Company evaluates short-term investments for other-than-temporary impairment at the balance sheet date. Declines in fair value, if any, determined to be other-than-temporary are also included in other income, net. When assessing short-term investments for other-than-temporary declines in value, the Company considers such factors as, among other things, how significant the decline in value is as a percentage of the original cost, how long the market value of the investment has been less than its original cost, and the Company’s ability and intent to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value and market conditions in general. The Company has the ability to hold its investments until maturity and generally does not intend to sell any investments prior to recovery of their amortized cost basis for any investment in an unrealized loss position. As of December 31, 2022 and 2021, there were no impairment charges on short-term investments.

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- Definition The entire disclosure for investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -URI https://asc.fasb.org/topic&trid=75115024 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -URI https://asc.fasb.org/topic&trid=2197064 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI https://asc.fasb.org/topic&trid=2196965 + Details
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- References No definition available. + Details
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