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Marketable Securities | 12 Months Ended
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Dec. 31, 2020
Marketable Securities |
Marketable Securities | 4. Marketable Securities The following table summarizes the Company’s investments as of December 31, 2020 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Marketable securities available-for-sale: | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |
U.S. Treasury obligations | ​ | $ | 180,675 | ​ | $ | 7 | ​ | $ | (9) | ​ | $ | 180,673
Total available-for-sale securities | ​ | $ | 180,675 | ​ | $ | 7 | ​ | $ | (9) | ​ | $ | 180,673
​ The following table summarizes the Company’s investments as of December 31, 2019 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Marketable securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury obligations | ​ | $ | 121,103 | ​ | $ | 39 | ​ | $ | (2) | ​ | $ | 121,140
Total available-for-sale securities | ​ | $ | 121,103 | ​ | $ | 39 | ​ | $ | (2) | ​ | $ | 121,140
​ The aggregate fair value of marketable securities with unrealized losses was $45.7 million and $19.6 million at December 31, 2020 and 2019, respectively. At December 31, 2020 and 2019, 5 investments and 3 investments, respectively, were in an unrealized loss position. All such investments have been in an unrealized loss position for less than a year and these losses are considered temporary. The Company has the ability and intent to hold these investments until a recovery of their amortized cost, which may be until maturity.

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