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Marketable Securities | 12 Months Ended
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Dec. 31, 2021
Marketable Securities |
Marketable Securities | 4. Marketable Securities The following table summarizes the Company’s investments as of December 31, 2021 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Marketable securities available-for-sale: | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |
U.S. Treasury obligations | ​ | $ | 40,194 | ​ | ​ | — | ​ | ​ | (35) | ​ | $ | 40,159
Total available-for-sale securities | ​ | $ | 40,194 | ​ | $ | — | ​ | $ | (35) | ​ | $ | 40,159
​ 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 aggregate fair value of marketable securities with unrealized losses was $30.2 million and $45.7 million at December 31, 2021 and 2020, respectively. At December 31, 2021 and 2020, 3 investments and 5 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 not occur until maturity.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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