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Short-Term Investments (Details) $ in Thousands | Mar. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($)
--- | --- | ---
Short-term Investments |  |
Short-Term Investments |  |
Amortized Cost | $ 66,182 | $ 39,000
Gross Unrealized Losses | (53) |
Fair Value | $ 66,129 | 39,000
Number of short term investments in unrealized loss position for less than 12 months | item | 15 |
Aggregate value of short term investments in unrealized loss position for less than 12 months | $ 26,300 |
Corporate debt securities |  |
Short-Term Investments |  |
Amortized Cost | 17,157 |
Gross Unrealized Losses | (36) |
Fair Value | 17,121 |
Commercial paper |  |
Short-Term Investments |  |
Amortized Cost | 5,987 |
Gross Unrealized Losses | (7) |
Fair Value | 5,980 |
Yankee securities |  |
Short-Term Investments |  |
Amortized Cost | 4,039 |
Gross Unrealized Losses | (10) |
Fair Value | 4,029 |
Treasury Bills |  |
Short-Term Investments |  |
Amortized Cost | 1,999 |
Fair Value | 1,999 |
Reverse repurchase agreements |  |
Short-Term Investments |  |
Amortized Cost | 37,000 | 39,000
Fair Value | $ 37,000 | $ 39,000

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- Definition Amount of cumulative unrecognized loss on investment in debt security measured at amortized cost (held-to-maturity) and 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563 + Details
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