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Short-Term Investments (Tables) | 9 Months Ended
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Sep. 30, 2021
Short-Term Investments |
Schedule of short term investments | The Company did not hold any short-term investments at September 30, 2021. The following table summarizes the short-term investments held at December 31, 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reverse repurchase agreements | ​ | $ | 20,000 | ​ | $ | — | ​ | $ | — | ​ | $ | 20,000
Total | ​ | $ | 20,000 | ​ | $ | — | ​ | $ | — | ​ | $ | 20,000
​

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