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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2022
Financial Instruments |
Schedule of assets and liabilities measured fair value on recurring basis | Below is a summary of assets and liabilities measured at fair value on a recurring basis (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of March 31, 2022
​ | ​ | Quoted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Prices | ​ | Significant | ​ | Significant | ​ | ​
​ | ​ | in Active | ​ | Observable | ​ | Unobservable | ​ | ​
​ | ​ | Markets | ​ | Inputs | ​ | Inputs | ​ | ​
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 8,145 | ​ | $ | — | ​ | $ | — | ​ | $ | 8,145
Corporate debt securities | ​ | ​ | — | ​ | ​ | 4,396 | ​ | ​ | — | ​ | ​ | 4,396
Commercial paper | ​ | ​ | — | ​ | ​ | 3,996 | ​ | ​ | — | ​ | ​ | 3,996
Reverse repurchase agreements | ​ | ​ | — | ​ | ​ | 3,000 | ​ | ​ | — | ​ | ​ | 3,000
Short term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities | ​ | ​ | — | ​ | ​ | 17,121 | ​ | ​ | — | ​ | ​ | 17,121
Commercial paper | ​ | ​ | — | ​ | ​ | 5,980 | ​ | ​ | — | ​ | ​ | 5,980
Yankee securities | ​ | ​ | — | ​ | ​ | 4,029 | ​ | ​ | — | ​ | ​ | 4,029
Treasury bills | ​ | ​ | 1,999 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,999
Reverse repurchase agreements | ​ | ​ | — | ​ | ​ | 37,000 | ​ | ​ | — | ​ | ​ | 37,000
Total | ​ | $ | 10,144 | ​ | $ | 75,522 | ​ | $ | — | ​ | $ | 85,666
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2021
​ | ​ | Quoted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Prices | ​ | Significant | ​ | Significant | ​ | ​
​ | ​ | in Active | ​ | Observable | ​ | Unobservable | ​ | ​
​ | ​ | Markets | ​ | Inputs | ​ | Inputs | ​ | ​
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 1,853 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,853
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reverse repurchase agreements | ​ | ​ | — | ​ | ​ | 39,000 | ​ | ​ | — | ​ | ​ | 39,000
Total | ​ | $ | 1,853 | ​ | $ | 39,000 | ​ | $ | — | ​ | $ | 40,853

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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