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v3.22.1

Short-Term Investments (Tables) | 3 Months Ended
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Mar. 31, 2022
Short-Term Investments |
Schedule of short term investments | The following table summarizes the short-term investments held at March 31, 2022 and December 31, 2021 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross Unrealized |  | Gross Unrealized |  | ​ | ​
​ | ​ | Amortized Cost | ​ | Gains | ​ | Losses | ​ | Fair Value
March 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities | ​ | $ | 17,157 | ​ | $ | — | ​ | $ | (36) | ​ | $ | 17,121
Commercial paper | ​ | ​ | 5,987 | ​ | ​ | — | ​ | ​ | (7) | ​ | ​ | 5,980
Yankee securities | ​ | ​ | 4,039 | ​ | ​ | — | ​ | ​ | (10) | ​ | ​ | 4,029
Treasury bills | ​ | ​ | 1,999 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,999
Reverse repurchase agreements | ​ | ​ | 37,000 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 37,000
Total | ​ | $ | 66,182 | ​ | $ | — | ​ | $ | (53) | ​ | $ | 66,129
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reverse repurchase agreements | ​ | $ | 39,000 | ​ | $ | — | ​ | $ | — | ​ | $ | 39,000
Total | ​ | $ | 39,000 | ​ | $ | — | ​ | $ | — | ​ | $ | 39,000
​

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