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Short-term Investments - Schedule of Available for Sale Short-term Investments by Major Security Type (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost Total | $ 44,957 | $ 54,533
Unrealized gains | 23 | 23
Unrealized (losses) | (1,071) | (658)
Fair Value Total | 43,909 | 53,898
Maturity by period Less than 1 year | 25,174 | 31,833
Maturity by period 1 to 5 years | 18,735 | 22,065
Commercial Paper |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost Total | 21,443 | 37,549
Unrealized gains | 19 | 17
Unrealized (losses) | (725) | (570)
Fair Value Total | 20,737 | 36,996
Maturity by period Less than 1 year | 16,683 | 31,833
Maturity by period 1 to 5 years | 4,054 | 5,163
U.S. Treasury Bills |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost Total | 23,514 | 16,984
Unrealized gains | 4 | 6
Unrealized (losses) | (346) | (88)
Fair Value Total | 23,172 | 16,902
Maturity by period Less than 1 year | 8,491 |
Maturity by period 1 to 5 years | $ 14,681 | $ 16,902

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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